On a purchase of $120， a store offered a p
题型：单项选择题
问题：
On a purchase of $120， a store offered a payment plan consisting of a $20 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 ？（）
A．16.7%
B．30%
C．75.8%
D．106.7%
E．107.5%