= 90) {
$grade = 'A';
} elseif ($average >= 80) {
$grade = 'B';
} elseif ($average >= 70) {
$grade = 'C';
} elseif ($average >= 60) {
$grade = 'D';
} else {
$grade = 'F';
}
echo "
";
echo "
Math: $math
";
echo "
English: $english
";
echo "
Science: $science
";
echo "
Average: " . number_format($average, 2) . "
";
echo "
Grade: $grade
";
echo "
";
?>