Mary invested some money in a certificate of deposit that earns interest at an annual rate of x percent compounded semi-annually. At the end of the first half-year, the amount in the certificate is $2060. At the end of the second half-year, the amount in the certificate is $2121.8. What is the annual interest rate on this certificate?
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A0.01
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B0.02
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C0.03
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D0.04
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E0.05
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正确答案: C