I bought two books; for Rs.540. 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? Choose the correct choice from the following
A) 197  B) 280  C) 189  D) 278  E) 315

Rationale: "x * ( 85 / 100 ) = ( 540 - x ) 119 / 100 x = 315 answer : e"
Answer: E