في مدرسة يُضاف إليها 5 صفوف من المقاعد إلى قاعة المدرج. كل صف يحتوي على 8 مقاعد وكل مقعد يีคoperators تكلفتها 30 دولاراً. قدم أحد الوالدين، والذي هو مصنّع مقاعد، خصماً بنسبة 10% على كل مجموعة من 10 مقاعد تم شراؤها. كم ستدفع المدرسة مقابل المقاعد الجديدة؟
يثمّن عشرة مقاعد 30$× 10 = 300$.
لذا هناك خصم 300$× 10/100 = 30$ عن كل عشرة مقاعد thats تم الشراء.
أي أن التكلفة الكلية لكل عشرة مقاعد هي 300$ - 30$ = 270 $.
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