On a purchase of $112, a store offered a payment plan consisting of a $12 down payment and 12 monthly payments of $10 each. What percent of the purchase price, to the nearest tenth of a percent, did the customer pay in interest by using this plan?	Choose the correct answer:	A) 10.7 %	B) 11.7 %	C) 12.7 %	D) 13.7 %	E) 14.7 %

Rationale: "12 * 10 + 12 = 132 ( 12 / 112 ) * 100 = 10.7 answer : a"
Answer: A