问一个问题 多谢 440, annual, investor, corporate

icrainbow

在CFA l1的第一本试题集里面的一道题目，An investor purchased a $10,000, 5-year corporate note one year ago for $10,440. The note pays an annual coupon of $600. Over the past year, the note's annual yield-to-maturity has dropped by 1%, what total return did the investor earn over the year?

标准答案是8.5%，不知道是怎么计算出来的……多谢各位了！