[問題]GWD24-18

[cktseng]

GWD24-18
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?
A. 1% B. 1.1% C. 9.1% D. 10% E. 10.8%
Answer C
我選D
請教是我搞錯意思了嗎?

[cktseng]

假設annual interest rate last year 為X
今年的annual interest rate earned by an investment increased by 10 percent from last year 所以今年的rate =1.1X
題目又提到the annual interest rate earned by the investment this year was 1 percent
所以1.1X-X=1% => X=10%

[王志元]

這題按照題意及你列的式子
應該是 1.1X=1% => X=0.91%
我想題目出錯了
the annual interest rate earned by the investment this year was "10" percent才對