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جلب المورد 300 قدم - 250 قدم = 50 قدمًا أقل من الألواح المعدنية.
لذلك المبلغ الإجمالي الذي يجب على السيد كايدن دفعه مقابل الأسقف المعدنية المتبقية هو 50 قدم * 8 دولار/قدم = 400 دولار.
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