问题如下：
An investor buys a 10-year bond with 6% annual coupon for $1,000 at par, and is going to hold the bond to maturity. Assuming coupon interest is reinvested at a bond's YTM, how many interest will the investor get over the whole life of the bond?
选项：
A.$1406.62.
B.$ 790.85.
C.$ 600.00.
解释：
B is correct.
The interest portion of a return consists of both the coupon payments and the reinvesting coupon payments, so it can be calculated as below:
N=10, PMT=60, PV=0, I/Y=6%, CPT FV= -790.85.
如果问的是总的利息收入的话，
这个解答里，求出来的 FV ，不是终值么，最后 到期日拿到的所有钱，应该是本金+利息一起啊？？
