On a certain sum, the simple interest at the end of 12 ½ years becomes ¾ of t

Question

On a certain sum, the simple interest at the end of 12 ½ years becomes ¾ of the sum. What is the rate percent per annum?

Options:

A . 4 %

B . 5 %

C . 6 %

D . 8 %

Answer: Option C

Let the sum be Rs x.
Then S.I = Rs 3x/4, Time = 25/2 Years
Therefore, Rate = (100 Ã— 3x/4 Ã— 1/x Ã— 2/25) % p.a
= 6 % p.a

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