Effective Annual Rate

题目

Effective Annual Rate
a sum of money is left invested for 3 years.In the first year,it earns interest at 15% compound monthly:in the second year,the rate of interest changes to 10% compounded quailty:in the third year,the rate of interest changes to 12% compounded daily.Find the effective rate of interest that would accumulate the same amount of interst t the end of 3 years?
in the second year,the rate of interest changes to 10% compounded quarterly

答案

我觉得是这样做的,不确定答案对不对,仅供参考啊!