一道我总算不对的利率问题求教!!

pychina

The annual interest rate earned by an investment increased by 10 percent from last year to this year. If the annual interest rate earned by the investment this year was 1 percent, what was the annual interest rate last year?

这题我算的与答案始终有点差,不知是我错还是答案错了还是想请教下各位算出的是多少.为了不误导大家,我先不写出答案了.

pychina

答案精确到一位小数就好了

cloudymind

去年 r1, 今年 r2 =1%, r2 = 110%* r1,

So, r1 = 0.909%，里面有什么 Trick 么？

pychina

答案是以下5个之一

1%

1.1%

9.1%

10%

10.8%

[此贴子已经被作者于2007-12-25 0:42:45编辑过]