At what percentage simple interest per annum a certain sum will double

1.	At what percentage simple interest per annum a certain sum will double in 10 years?A. 7%B. 8%C. 9%D. 10%
A.	B
B.	A
C.	D
D.	C
Answer» D. C

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At what percentage simple interest per annum a certain sum will double in 10 years?A. 7%B. 8%C. 9%D. 10%

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