题目是
A company pays 100 for a bond with annual coupons X to get an effective rate of
5%. The amount of interest in the 5th coupon is 4.85. Determine X.
解答是 5.70.
后面解答其实我看得懂.. 方法是 B4 = 100 * (1+5%)^4 - X * S(4)

加油推!礼拜一就考了帮集气

5.7代入进去算 没有错阿

最后一式求解不就出来了吗

天阿 我竟然笨了一个下午.. 我知道式子没列错了 谢谢 :)惊险拿到congratulations...