Arithmetichard · Past Paper
A shopkeeper earns 15% profit by selling a book at 10% discount on the printed price. Ratio of CP to printed price is?
A18:23
B23:18
C20:23
D23:20
✓ Correct Answer: A — 18:23
SP = 0.9 * MP. SP = 1.15 * CP. 0.9 MP = 1.15 CP => CP/MP = 0.9/1.15 = 90/115 = 18/23.
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