I bought two books; for Rs.420. 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 one.
A) 197 B) 245 C) 189 D) 278 E) 268

Rationale: "x * ( 85 / 100 ) = ( 420 - x ) 119 / 100 x = 245 answer : b"
Answer: B