[CFA Level 1] 请教1道一级题 special, payments, investor, interest, deposits

arabdopsis1

 1. In three years, an investor deposits the first of eight $1000 payments into a special fund. The fund will earn interests at the rate of 5% per year until the end of the fifth year. Thereafter, all money accumulated in the fund will earn a reduced interest rate of 4% compounded annually until the end of the tenth year. How much money will the investor have in the fund at the end of ten years assuming no withdrawals are made?
A. $8416.32
B. $8872.93
C. $9251.82
D. $9549.11

答案是C （我第一句话怎么都读不懂，这个钱到底怎么存的啊）

arabdopsis1

 thanks!
是不是（这是第三年末开始投钱）
1k* (1+5%)^7+1k*1.05^6+1k*1.05^5+1k*1.05^4+1k*1.04^3+1k*1.04^2+1k*1.04+1k

得不到C的值啊？
用第三年初投1k开始算答案也不对

多谢指教

arabdopsis1

算出来啦； 多谢多谢！