b-cena hurtowa
b+a% *b=b+(a/100)*b=b(1+ a/100) -cena detaliczna 1. podrecznika
25b(1+a/100) -wartosc 25 podrecznikow w detalu
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b-cena hurtowa
b+a% *b=b+(a/100)*b=b(1+ a/100) -cena detaliczna 1. podrecznika
25b(1+a/100) -wartosc 25 podrecznikow w detalu
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