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I bought two books; for Rs.480. I sold one at a loss of 15% and other at a gain of 19% and then I found each book was sold at the same price. Find the cost of the book sold at a loss?

I bought two books; for Rs.480. I sold one at a loss of 15% and other at a gain of 19% and then I found each book was sold at the same price. Find the cost of the book sold at a loss?

A. Rs.28
B. Rs.280
C. Rs.140
D. Rs.70
Explanation:
x*(85/100) = (480 – x)119/100
x = 280