问题如下:
Mary has a separate account for her annual savings which has a stated annual rate of 3% and compounding quarterly. At the end of each year, she transfers unequal cash flows into this account. Year 1: $500, Year 2: $800, Year 4: $300, Year 5: $500. How much will Mary save for her account at the end of year 5?
选项:
A.$2246.81
B.$2247.65
C.$2281.00
解释:
B is correct.
为什么第一年是4*4次方,第二年就是4*3依次递减?没看懂。。。