A certain sum becomes 4 times in 7 years, at simple interest, then in how many years it will become 16 times?

A certain sum becomes 4 times in 7 years, at simple interest, then in

1.	A certain sum becomes 4 times in 7 years, at simple interest, then in how many years it will become 16 times?
A.	16
B.	21
C.	28
D.	35
Answer» E.

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A certain sum becomes 4 times in 7 years, at simple interest, then in how many years it will become 16 times?

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