= 80) { $grade = "A"; } elseif ($total >= 75) { $grade = "B+"; } elseif ($total >= 70) { $grade = "B"; } elseif ($total >= 65) { $grade = "C+"; } elseif ($total >= 60) { $grade = "C"; } elseif ($total >= 55) { $grade = "D+"; } elseif ($total >= 50) { $grade = "D"; } else { $grade = "F"; } // แสดงผลลัพธ์ echo "
"; echo "

ผลการประมวลผล

"; echo "

คะแนนรวม: $total คะแนน

"; echo "

เกรด: $grade

"; echo "
"; } ?>