100 üzerinden 25'i hesaplamak için, sayıyı 25 ile çarpıp 100'e bölmek gerekir. Formül: Sayı x (25 ÷ 100) = Sonuç Örnek: 400 sayısının %25'i: 400 x (25 ÷ 100) = 400 x 0,25 = 100.
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