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بلغت تكلفة الألواح الثقيلة 200 * 1.2 = 240 دولارًا. 
لذا بلغت تكلفة سترته 250 + 240 = 490 دولارًا. 
كان بإمكانه الحصول على الستر الآخر مقابل 700 - 100 = 600 دولار. 
لذا وفقت 600 - 490 = 110 دولار. #### 110