50 sayısının %20'si 10 eder. Hesaplama şu şekilde yapılır: 1. 50 sayısı 100'e bölünür: 50 ÷ 100 = 0,5. 2. Yüzde kaç ise (20) bu sonuç (0,5) ile çarpılır: 0,5 × 20 = 10.
200'ün %20'si 40'tır. Hesaplama şu şekilde yapılır: 1. 200 ÷ 100 = 2 (200 sayısını 100'e böleriz). 2. 2 × 20 = 40 (Elde edilen sonucu yüzde kaç ise (20) o sayı ile çarparız).
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