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كان سعر الشاي ضعف سعر الجبن، لذلك كان سعر الجبن 10/2 = 5 دولارات.
كان سعر الزبدة 80/100 × 5 = 4 دولارات.
إذا كان السعر الخبز رخيصاً نصف سعر الزبدة، يعني حسابه 4/2 = 2 دولارات.
هذا يعني أن أورسولا دفعت مقابل كل تسوقها 2 + 4 + 5 + 10 = 21 دولاراً.
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