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Assume that you have bought X jackets for $500. So cost price of each jacket is (500/X ).

Selling price of each jackets is $25.

a) Profit = 25*X- (500) (selling price * no of jackets - total cost) b) Profit for 50 jackets = 25*50- (500) = 750

C) total cost price = $500. And selling of each jacket is price is $25. Hence to get back our investment, we need 500/25 jackets ; X=500/25 = 20 jackets .