8C_How to Calculate The Ideal Weight

<html>
    <head>
    <title>If Statement</title>
    </head>
<body>
<form method="post"action=" ">
    Tinggi Badan <input type="text" name="tinggi" /><br/>
    Berat Badan <input type="text" name="berat" /><br/>
    <input type="submit" name="submit" value="submit" />
    <input type="reset" name="reset" value="reset" /><br/>
<?php
    $tinggi = $_POST[tinggi];
    $berat = $_POST[berat];
    $rumus1 = $tinggi - 100;
    $bbi = $rumus1 - (0.1 * $rumus1);
    $hasil = $berat - $bbi;
    if ($hasil > 2)
    {
        echo "Berat Badan Anda Tidak Ideal </br>";
    }
    else if ($hasil <= 2 )
    {
        echo "Berat Badan Anda Ideal </br>";
    }
    echo "Tinggi Badan Anda = ".$tinggi." cm </br>";
    echo "Berat Badan Anda = ".$berat." kg </br>";
?>
</form>
</body>
</html>