In a show room, the marked prices of various items are displayed in such a manner that after giving a 10% discount to the customers, the owner of the show room earns a profit of 20%. What is the ratio of the marked price and cost price of each item?
A.4:3✓ Correct
B.3:4
C.5:2
D.2:5
Explanation
Let CP = 100, then SP = 120 (20% profit). SP = MP × 0.9 = 120, so MP = 120/0.9 = 400/3. Ratio MP:CP = (400/3):100 = 4:3.
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