40'ın yüzde 25'i 10'dur. Hesaplama şu şekilde yapılır: 1. 40 sayısı 100'e bölünür: 40 ÷ 100 = 0.4. 2. Yüzde kaç ise (25) bu sonuç (0.4) ile çarpılır: 0.4 × 25 = 10.
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