At what rate percent on simple interest will a sum of money double

1.	At what rate percent on simple interest will a sum of money double itself in 30 years?
A.	3 1/3 %
B.	3 1/2%
C.	4 %
D.	4 1/2 %
Answer» B. 3 1/2%

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At what rate percent on simple interest will a sum of money double itself in 30 years?

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