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<?php
include_once '../include/DBConnect.php';
$percent = 0;
if (isset($_POST['subsidy'])) {
    $subsidy_id = $_POST['subsidy'];
    for ($i = 0; $i < count($subsidy_id); $i++) {
        $query = "Select percent from subsidy where Subsidy_ID='$subsidy_id[$i]'";
        $result = $dbh->query($query);
        $result->setFetchMode(PDO::FETCH_OBJ);
        $percent+=($result->fetch()->percent);
    }
}
echo $percent."%";
?>