Developed this Cleaning Cost Estimate Calculator for Open for Suggestions 
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Carpet Cleaning Cost Estimator</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 20px;
}
h1 {
text-align: center;
}
form {
max-width: 400px;
margin: 0 auto;
}
input[type="number"], input[type="text"] {
width: 100%;
padding: 10px;
margin: 10px 0;
box-sizing: border-box;
}
button {
width: 100%;
padding: 10px;
margin: 10px 0;
box-sizing: border-box;
background-color: #4CAF50;
color: white;
border: none;
cursor: pointer;
}
button:hover {
background-color: #45a049;
}
</style>
</head>
<body>
<h1>Carpet Cleaning Cost Estimator</h1>
<form id="carpet-cleaning-form">
<h4>Area to be Cleaned (in square feet):</h4>
<input type="number" id="area" name="area" min="0" placeholder="Enter area. e.g 300" required>
<h4>Enter your rate per square foot:</h4>
<input type="number" id="rate" name="rate" min="0" placeholder="Enter rate per sq. ft. e.g 0.45" required>
<button type="button" onclick="calculateCost()">Calculate Cost</button>
</form>
<div id="cost-result" style="display: none;">
<h2>Estimated Cost:</h2>
<p id="cost"></p>
</div>
<script>
function calculateCost() {
var area = parseFloat(document.getElementById('area').value);
var rate = parseFloat(document.getElementById('rate').value);
var totalCost = area * rate;
document.getElementById('cost').textContent = '$' + totalCost.toFixed(2);
document.getElementById('cost-result').style.display = 'block';
}
</script>
</body>
</html>