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.	14
B.	28
C.	21
D.	10
Answer» D. 10

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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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