el libro costo s/ 20
s/20 + 40 % = 8
s/ 20 + 8 = s/ 28
se vende en s/ 28 para ganarle el 40 %
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el libro costo s/ 20
s/20 + 40 % = 8
s/ 20 + 8 = s/ 28
se vende en s/ 28 para ganarle el 40 %