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تكلف الدجاج 80 دولارًا لأن 4 × 20 = 80
دجاجته تنتج وف пра دزينة من البيض في الأسبوع لأن 4 × 3 = 12
كل أسبوع يمتلك فيه دجاجة أ較 rẻ من شراء البيض لأن 2 - 1 = 1
بعد 80 أسبوعًا ستكف الدجاجة تكاليفها لأن 80 ÷ 1 = 80
بعد 81 أسبوعًا تصبح الدجاجة أرخص من شراء البيض لأن 80 + 1 = 81
#### 81