Timmy grew by 10% between the ages of 6 and 8 and by 20% between the ages of 6 and 10. Which of the following is closest

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Timmy grew by 10% between the ages of 6 and 8 and by 20% between the ages of 6 and 10. Which of the following is closest to the percentage by which Timmy grew between the ages of 8 and 10?

A. 7%
B. 8%
C. 9%
D. 10%
E. 11%

[spoiler]OA=C[/spoiler]

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