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At a certain annual rate (rounded off to the nearest integer) of simple interest, a sum of money becomes nine times its original value in 21 years. By
Question

At a certain annual rate (rounded off to the nearest integer) of simple interest, a sum of money becomes nine times its original value in 21 years. By how much does the rate of interest change if the same sum of money has to become 12 times its original value in 25 years?

A.

Decreases by 6%

B.

Increases by 6%

C.

Increases by 8%

D.

Decreases by 8%

Correct option is B

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