On a purchase of $130, a store offered a payment plan consisting of a $30 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 option
A) 23.5 %  B) 24.5 %  C) 23.1 %  D) 25.5 %  E) 26.5 %

Rationale: 12 * 10 + 30 = 150 . ( 30 / 130 ) * 100 = 23.1 answer : c
Answer: C