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له 30*6 = 180 طالبًا
لذلك يحتاج إلى شراء 180*10 = 1800 بطاقة فهرس
وهذا يعني أنه يحتاج إلى شراء 1800/50 = 36 หزمة من بطاقات الفهرس
إذا فقد يقضي 36*3 = 108 دولار