Exam - 05 November 2017 - 04. External Evaluation

<?php
$numStudents = intval(readline());
$counterA = 0;
$counterB = 0;
$counterC = 0;
$counterD = 0;
$counterE = 0;
for($i = 0; $i < $numStudents; $i++){
    $points [] = floatval(readline());
}
foreach ($points as $key=>$val) {
    if ($val >= 0 && $val < 22.5) {
         $counterA ++;
    }
    if ($val >= 22.5 && $val < 40.5) {
        $counterB ++;
    }
    if ($val >= 40.5 && $val < 58.5) {
        $counterC ++;
    }
    if ($val >= 58.5 && $val < 76.5) {
        $counterD ++;
    }
    if ($val >= 76.5 && $val <= 100) {
        $counterE ++;
    }
}
$sum = $counterA + $counterB + $counterC + $counterD + $counterE;
echo sprintf("%.2f", $counterA / $sum * 100)."% poor marks\n";
echo sprintf("%.2f", $counterB / $sum * 100)."% satisfactory marks\n";
echo sprintf("%.2f", $counterC / $sum * 100)."% good marks\n";
echo sprintf("%.2f", $counterD / $sum * 100)."% very good marks\n";
echo sprintf("%.2f", $counterE / $sum * 100)."% excellent marks";