下颌关节间隙正常值为（）

A.1.5mm

B.1.8mm

C.2.0mm

D.2.5mm

E.3.0mm

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%