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ماكاي تدفع 10 * 0.10 = 1 دولارًا مقابل أقلام التلوين الزرقاء.
كل قلم أحمر يبلغ سعره 2*$0.10 = 0.20 دولارًا.
تدفع 15*$0.20 = 3.00 دولارًا مقابل أقلام التلوين الحمراء.
لشراء كافة أقلام القلم، تدفع ماكاي 3+1= 4 دولارًا
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