A simple program that will ask the user to give prelim, midterm, and endterm grade and then the program will compute the average grade of the student using PHP programming language.

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Program Listing

<?php 
    if(isset($_POST["grade1"], $_POST["grade2"], $_POST["grade3"])) {
        $calc = $_POST["grade1"] + $_POST["grade2"] +$_POST["grade3"];
        $calc = round($calc / 3, 2);
        $avg = '<div>You average grade is: <strong>'.$calc.'</strong></div>';
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Average Grade Solver</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #f1f1f1;
            font-family: sans-serif;
        }
        main {
            padding: 30px;
            border-radius: 2px;
            background-color: #fff;
        }
        h1 {
            margin-bottom: 10px;
            line-height: 1;
            text-transform: uppercase;
            font-size: 28px;
            text-align: center;
        }
        h2 {
            margin-bottom: 30px;
            line-height: 1;
            font-size: 20px;
            text-align: center;
        }
        .block {
            margin: 0 auto 10px;
        }
        label {
            display: block;
            margin-bottom: 5px;
        }
        input {
            padding: 8px;
            width: 100%;
        }
        button {
            padding: 8px 16px;
            background-color: #607d8b;
            color: #fff;
            outline: 0;
            border: 0;
            border-radius: 3px;
            cursor: pointer;
            width: 150px;
            width: 100%;
            margin-bottom: 20px;
        }
        button + div {
            font-size: 18px;
            text-align: center;
            background-color: #ffeb3b;
            padding: 10px;
            border-radius: 3px;
        }
    </style>
</head>
<body>
    <main class="container">
        <h1>Average Grade Solver in PHP</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <form action="" method="post">
            <div class="block">
                <label for="grade1">Give Prelim Grade:</label>
                <input type="number" min=0 name="grade1" id="grade1">
            </div>
            <div class="block">
                <label for="grade2">Give Midterm Grade:</label>
                <input type="number" min=0 name="grade2" id="grade2">
            </div>
            <div class="block">
                <label for="grade3">Give Final Grade:</label>
                <input type="number" min=0 name="grade3" id="grade3">
            </div>
            <button type="submit">Submit</button>

            <?php if(isset($avg)) echo $avg; ?>
        </form>
    </main>
</body>
</html>

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