The first annual interest rate was 9%. In the second year, the investor used the principal and interest of the first year as the principal for investment. The annual interest rate of the second year was 10%. At the end of the second year, the sum of the initial principle and the interest of these two years was $20000. How much was the initial principal?
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A16610
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B16632
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C16640
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D16645
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E16681
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正确答案: E