进入20世纪70年代以来，主要资本主义国家开始陷入经济停滞、通货膨胀并存的“滞胀”局面。

请运用所学知识解释凯恩斯主义影响下降、新自由主义思想兴起的原因。

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%