A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years=?

A certain sum doubles in 7 years at simple interest. The same sum unde

1.	A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years=?
A.	4 years
B.	8 years
C.	1 years
D.	0 years
Answer» D. 0 years

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A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years=?

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