I sold a book at a profit of 10%. Had I sold it for $110 more, 15% would have been gained. Find the cost price?	Choose the correct choice from the following options
A) $ 2000	B) $ 2200	C) $ 3000	D) $ 3120	E) $ 1540

Rationale: 115 % of cost - 110 % of cost = $ 110 5 % of cost = $ 110 cost = 110 * 100 / 5 = $ 2200 answer is b
Answer: B