done to tip-cal-by using react

src/App.css

@@ -0,0 +1,53 @@
+body{
+    margin: 0px;
+    padding: 0px;
+    box-sizing: border-box;
+}
+.container{   
+     text-align: center;
+    padding-top: 14%;
+    height: 35vw;
+    width: 100%;
+
+}
+.child {
+    background-color: #354f52;
+    display: inline-block;
+    padding: 20px 100px;
+    border: 3px black solid;
+    border-radius: 30px;
+
+
+}
+
+.header {
+    background-color: #457b9d;
+    display: inline-block;
+    padding: 0px 10px;
+    border: 2px solid black;
+    border-radius: 10px;
+    color: #f2f2f2;
+}
+.inputs{
+    /* border-radius: 5px; */
+    /* color: #457b9d; */
+    margin: 10px;
+    font-family: sans-serif;
+
+}
+.inputs >input{
+    width: 250px;
+    height: 30px;
+    border-radius: 7px;
+}
+
+.inputs>button{
+    /* color: aqua; */
+    margin-top: 10px;
+    border-radius: 5px;
+    background-color: brown;
+    width: 100px;
+    height: 40px;
+    font-size: 15px;
+    color: white;
+}

src/App.js

@@ -1,9 +1,40 @@
 import "./App.css";
+import { useState } from "react";
 
 function App() {
+  const[input, setInput ]= useState()
+  const[total, setTotal]= useState()
+
+  function calcTip(){
+    if (input>=50&& input<=300){
+      let tip1= input*0.15
+      let total1 = input * 0.15 / 0.15 + input * 0.15
+      let final= `your bill is ${input} and your tip is ${tip1} and your total is ${total1}`
+      setTotal(final)
+    } else{
+      let tip2= input*0.20
+      let total2 = input * 0.20/ 0.20 + input * 0.20
+      let final= `your bill is ${input} and your tip is ${tip2} and your total is ${total2}`
+      setTotal(final)
+    }
+  }
+
   return (
     <div>
-      <h1>Hello World</h1>
+      <div class="container">
+        <h1>TIP CALCULATOR</h1>
+       <div class="inputs">
+        <input onChange={(e)=>setInput(e.target.value)} placeholder="Ener your bill" type="number"/>
+        <br/>
+        <button onClick={calcTip}>Calculate</button>
+        <br/>
+        <h2 class="restult">{total} </h2>
+
+
+
+       </div>
+    </div>
+
     </div>
   );
 }