A cooler is marked at Rs. 1,500. After a 20% discount, the shopkeeper still makes a 20% profit. What is the cost price?
Correct answer D. Rs. 1,000
Explanation
SP = 1,500 × 0.80 = Rs. 1,200. CP = 1,200 × 100/120 = Rs. 1,000. Taking 20% off the SP gives 960, which uses the wrong base.
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