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اثنان وعشرون من الأقلام مساويين 2 × 12 = 24 قلمًا.
لذا فإن التكلفة الإجمالية للأقلام هي 0.5 × 24 = 12 دولارًا.
التكلفة الإجمالية للمجلدات هي 0.9 × 20 = 18 دولارًا.
إذًا فالتكلفة لشراء الإمدادات المكتبية هي 12 + 18 = 30 دولارًا.
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