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حصل على 250 * 0.8 = 200 دولارًا.
يحصل على خصم 600 * 0.25 = 150 دولارًا على النظام الثاني.
إذا كانت التكلفة هي 600 - 150 = 450 دولارًا.
لذا كان 450 - 200 = 250 دولارًا في جيبه.
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