问题如下：
A company issues €10,000,000 face value of 10-year bonds dated 1 January 2015 when the market interest rate on bonds of comparable risk and terms is 6%. The bonds pay 7% interest annually on 31 December. Based on the effective interest rate method, the interest expense on 31 December 2015 is closest to:
选项：
A. €644,161.
B. €700,000.
C. €751,521.
解释：
A is correct.
N=10, I/Y=6, FV=10,000,000, PMT=700,000, → PV= €10,736,008.71
The interest expense is calculated by multiplying the carrying amount at the beginning of the year by the effective interest rate at issuance. As a result, the interest expense at 31 December 2015 is €644,161 (€10,736,008.71 × 6%).
这道题我计算BASE法则全都会，但是对于题目问法很困惑。这个interest rate 应该是2015年支付的annual interest expense. 但是为什么问at the end of 2015??? 我开始认为是用 PV @ end of 2015*interest rate 计算下一年的interest rate 呢
