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a+b = 0,25b +b = 1,25b
n/100 ·(a+b) = n/100 ·1,25b ⇒ 1,25bn /100 = b ⇒ 1,25bn = 100b ⇒
⇒ n = 100b ÷ 1,25b ⇒ n = 80
80% ·1,25b = 100% ·b = b