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 11 percent, what was the annual interest rate last year?


1%

1.1%

9.1%

10%

10.8%

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题目分析：

假设去年的投资利率是 L,今年比去年增加了 10%.则今年的投资利率=L*(1+10%)=11%. L=11%/(1+10%)=10%.

综上答案就是 D

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