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Let the cost price of each book , copy, and file be 4a, 2a, a Selling price of each book = 2000/10=200 Selling price of each copy = 1500/30=50 Selling price of each file = 1200/20=60 Profit percentage on book = ((200-4a))/4a×100 Profit percentage on copy = ((50-2a))/2a×100 As per the question y=4x ((50-2a))/2a×100 = ((200-4a))/4a×100×4 a= 55 Hence cost price of each file is Rs 55 Profit percentage after selling each file = ((60-55))/55×100 = (5/55) × 100 = 9(1/11)%
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