Question
A merchant bought 300 goods at Rs. 50 each. He sold a
part at a 20% profit and the rest at a 10% loss. If his overall profit is 4%, how many goods did he sell at a 20% profit?Solution
ATQ, Cost price of 300 goods = 300 Γ 50 = Rs. 15000 Selling price of 300 goods = 1.04 Γ 15000 = Rs. 15600 Let number of goods sold at a 20% profit be βxβ Then, goods sold at 10% loss = (300 β x) So, 1.20 Γ 50 Γ x + 0.90 Γ 50 Γ (300 β x) = 15600 Or, 1.2x + 270 β 0.9x = 15600 / 50 = 312 Or, 0.3x = 42 Or, x = 140
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