这道题目在ASM FM第174页,题干是
Harrier wishes to accumulate 60,000 in a fund at the end of 25 years. She plans to deposit 80 into the fund at the end of each of the first 120 months, She then plan to deposit 80+x into the fund at the end of each of the last 180 months. Assume the fund earns interest at an annual effective rate of 3.66%,Determine x.