Diana took out a charge account at the General Store and agreed to pay 6% simple annual interest. If she charges $60 on her account in January, how much will she owe a year later, assuming she does not make any additional charges or payments? Choose the correct choice
A) $ 62.40
B) $ 62.80
C) $ 63.20
D) $ 63.60
E) $ 64.00

Rationale: "1.06 * $ 60 = $ 63.60 the answer is d ."
Answer: D