diff --git a/finance-tracker/.gitignore b/finance-tracker/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/finance-tracker/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/finance-tracker/.prettierrc b/finance-tracker/.prettierrc
new file mode 100644
index 0000000..af11965
--- /dev/null
+++ b/finance-tracker/.prettierrc
@@ -0,0 +1,5 @@
+{
+  "singleQuote": true,
+  "semi": true,
+  "trailingComma": "es5"
+}
diff --git a/finance-tracker/app.js b/finance-tracker/app.js
index 7cfcd07..2fe2b91 100644
--- a/finance-tracker/app.js
+++ b/finance-tracker/app.js
@@ -1,3 +1,83 @@
-// This is the entrypoint for your application.
+// This is the entrypoint for your application
 // node app.js
+const chalk = require('chalk');
+const transactions = require('./data');
+const {
+  getTotalIncome,
+  getTotalExpenses,
+  getBalance,
+  getTransactionsByCategory,
+  getLargestExpense,
+  getTransactionsByDateRange,
+  averageExpensePerCategory,
+} = require('./finance');
 
+// Display all transactions
+function printAllTransactions() {
+  console.log(chalk.bold('\n💰 PERSONAL FINANCE TRACKER 💰\n'));
+  console.log('All Transactions:');
+
+  transactions.forEach((t, i) => {
+    const label =
+      t.type === 'income' ? chalk.green('[INCOME]') : chalk.red('[EXPENSE]');
+    const amountColor =
+      t.type === 'income'
+        ? chalk.green(`€${t.amount}`)
+        : chalk.red(`€${t.amount}`);
+    console.log(
+      `${i + 1}. ${label} ${t.description} - ${amountColor} (${chalk.yellow(t.category)})`
+    );
+  });
+}
+
+// Display transactions by date range
+function printTransactionsByDateRange(start, end) {
+  const results = getTransactionsByDateRange(start, end);
+  console.log(chalk.bold(`\nTransactions from ${start} to ${end}:`));
+
+  results.forEach((t, i) => {
+    const label =
+      t.type === 'income' ? chalk.green('[INCOME]') : chalk.red('[EXPENSE]');
+    const amountColor =
+      t.type === 'income'
+        ? chalk.green(`€${t.amount}`)
+        : chalk.red(`€${t.amount}`);
+    console.log(
+      `${i + 1}. ${label} ${t.description} - ${amountColor} (${chalk.yellow(t.category)})`
+    );
+  });
+}
+
+// Display summary
+function printSummary() {
+  const income = getTotalIncome();
+  const expenses = getTotalExpenses();
+  const balance = getBalance();
+  const largestExpense = getLargestExpense();
+
+  console.log(chalk.bold('\n📊 FINANCIAL SUMMARY 📊'));
+  console.log(chalk.bold(`Total Income: €${income}`));
+  console.log(chalk.bold(`Total Expenses: €${expenses}`));
+
+  const balanceText =
+    balance >= 0 ? chalk.cyan(`€${balance}`) : chalk.red(`€${balance}`);
+  console.log(chalk.bold('Current Balance: '), balanceText);
+
+  if (largestExpense) {
+    console.log(
+      `\nLargest Expense: ${largestExpense.description} (€${largestExpense.amount})`
+    );
+  }
+
+  console.log(`Total Transactions: ${transactions.length}`);
+
+  const averages = averageExpensePerCategory();
+  console.log(chalk.bold('\nAverage Expense per Category:'));
+  for (const category in averages) {
+    console.log(`${chalk.yellow(category)}: €${averages[category].toFixed(2)}`);
+  }
+}
+
+printAllTransactions();
+printSummary();
+printTransactionsByDateRange('2025-01-01', '2025-01-25');
diff --git a/finance-tracker/data.js b/finance-tracker/data.js
index d7863ff..6c0e436 100644
--- a/finance-tracker/data.js
+++ b/finance-tracker/data.js
@@ -1,2 +1,101 @@
 // Place here the transaction data array. Use it in your application as needed.
-const transactions = [];
\ No newline at end of file
+const transactions = [
+  {
+    id: 1,
+    type: 'income',
+    category: 'salary',
+    amount: 3000,
+    description: 'Salary',
+    date: '2025-01-15',
+  },
+  {
+    id: 2,
+    type: 'expense',
+    category: 'housing',
+    amount: 1200,
+    description: 'Rent',
+    date: '2025-01-01',
+  },
+  {
+    id: 3,
+    type: 'expense',
+    category: 'food',
+    amount: 450,
+    description: 'Groceries',
+    date: '2025-01-10',
+  },
+  {
+    id: 4,
+    type: 'income',
+    category: 'side-income',
+    amount: 700,
+    description: 'Freelance',
+    date: '2025-01-20',
+  },
+  {
+    id: 5,
+    type: 'expense',
+    category: 'bills',
+    amount: 300,
+    description: 'Utilities',
+    date: '2025-01-05',
+  },
+  {
+    id: 6,
+    type: 'expense',
+    category: 'transport',
+    amount: 120,
+    description: 'Public transport',
+    date: '2025-01-12',
+  },
+  {
+    id: 7,
+    type: 'expense',
+    category: 'entertainment',
+    amount: 200,
+    description: 'Cinema & dinner',
+    date: '2025-01-18',
+  },
+  {
+    id: 8,
+    type: 'income',
+    category: 'bonus',
+    amount: 400,
+    description: 'Performance bonus',
+    date: '2025-01-25',
+  },
+  {
+    id: 9,
+    type: 'expense',
+    category: 'health',
+    amount: 90,
+    description: 'Pharmacy',
+    date: '2025-01-08',
+  },
+  {
+    id: 10,
+    type: 'expense',
+    category: 'shopping',
+    amount: 250,
+    description: 'Clothes',
+    date: '2025-01-22',
+  },
+  {
+    id: 11,
+    type: 'income',
+    category: 'gift',
+    amount: 150,
+    description: 'Birthday gift',
+    date: '2025-01-28',
+  },
+  {
+    id: 12,
+    type: 'expense',
+    category: 'food',
+    amount: 80,
+    description: 'Restaurant',
+    date: '2025-01-27',
+  },
+];
+
+module.exports = transactions;
diff --git a/finance-tracker/finance.js b/finance-tracker/finance.js
index ac2118f..8cd6b56 100644
--- a/finance-tracker/finance.js
+++ b/finance-tracker/finance.js
@@ -1,27 +1,91 @@
+const transactions = require('./data');
+
+// Add new transaction
 function addTransaction(transaction) {
-  // TODO: Implement this function
+  transactions.push({ ...transaction });
 }
 
+// Total income
 function getTotalIncome() {
-  // TODO: Implement this function
+  let total = 0;
+  for (const transaction of transactions) {
+    if (transaction.type === 'income') total += transaction.amount;
+  }
+  return total;
 }
 
+// Total expenses
 function getTotalExpenses() {
-  // TODO: Implement this function
+  let total = 0;
+  for (const transaction of transactions) {
+    if (transaction.type === 'expense') total += transaction.amount;
+  }
+  return total;
 }
 
+// Current balance
 function getBalance() {
-  // TODO: Implement this function
+  return getTotalIncome() - getTotalExpenses();
 }
 
+// Filter transactions by category
 function getTransactionsByCategory(category) {
-  // TODO: Implement this function
+  const result = [];
+  for (const transaction of transactions) {
+    if (transaction.category.includes(category)) result.push(transaction);
+  }
+  return result;
 }
 
+// Find largest expense
 function getLargestExpense() {
-  // TODO: Implement this function
+  let largest = null;
+  for (const transaction of transactions) {
+    if (
+      transaction.type === 'expense' &&
+      (!largest || transaction.amount > largest.amount)
+    ) {
+      largest = transaction;
+    }
+  }
+  return largest;
+}
+
+// Search by date range
+function getTransactionsByDateRange(start, end) {
+  const result = [];
+  for (const transaction of transactions) {
+    if (transaction.date >= start && transaction.date <= end)
+      result.push(transaction);
+  }
+  return result;
+}
+
+// Average expense per category
+function averageExpensePerCategory() {
+  const totals = {};
+  const counts = {};
+  for (const transaction of transactions) {
+    if (transaction.type === 'expense') {
+      totals[transaction.category] =
+        (totals[transaction.category] || 0) + transaction.amount;
+      counts[transaction.category] = (counts[transaction.category] || 0) + 1;
+    }
+  }
+  const averages = {};
+  for (const category in totals) {
+    averages[category] = totals[category] / counts[category];
+  }
+  return averages;
 }
 
-function printAllTransactions() {
-  // TODO: Implement this function
-}
\ No newline at end of file
+module.exports = {
+  addTransaction,
+  getTotalIncome,
+  getTotalExpenses,
+  getBalance,
+  getTransactionsByCategory,
+  getLargestExpense,
+  getTransactionsByDateRange,
+  averageExpensePerCategory,
+};
diff --git a/finance-tracker/package-lock.json b/finance-tracker/package-lock.json
new file mode 100644
index 0000000..2195e5f
--- /dev/null
+++ b/finance-tracker/package-lock.json
@@ -0,0 +1,105 @@
+{
+  "name": "finance-tracker",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "finance-tracker",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "chalk": "^4.1.2"
+      },
+      "devDependencies": {
+        "prettier": "^3.8.1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
+    "node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/prettier": {
+      "version": "3.8.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.1.tgz",
+      "integrity": "sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/finance-tracker/package.json b/finance-tracker/package.json
new file mode 100644
index 0000000..04f03bb
--- /dev/null
+++ b/finance-tracker/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "finance-tracker",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "chalk": "^4.1.2"
+  },
+  "devDependencies": {
+    "prettier": "^3.8.1"
+  }
+}