Quantity I: A shopkeeper bought 300 pens for Rs 1200. He wanted to sell them at a profit so that he got 36 pens for free. At what profit percent should he sell them?

Quantity II: 12%

C.P of 300 pens = Rs.1200 Profit = C.P of 36 pens Profit % = (Profit/CP) × 100 C.P of 1 pen = 1200/300 = Rs 4 C.P of 36 pens = 36 × 4 = Rs 144 Required profit is Rs 144 on Rs 1200 ∴ Profit% = (144/1200) × 100 = 12% Quantity II: 12% Hence, Quantity I = Quantity II

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