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تكلفة الأبواب الخارجية 2 × 20 = 40 دولارًا.
كل باب داخلي يكلف 20/2 = 10 دولار.
نتيجة لذلك تكلفة جميع الأبواب الداخلية 10 × 3 = 30 دولارًا.
هذا يعني أن التكلفة الإجمالية هي 40 + 30 = 70 دولارًا.
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