At what rate of simple interest a certain sum will be doubled in 15 years? Options: A . &nbsp5 ½ % p.a B . &nbsp6 % p.a C . &nbsp6 2/3 % p.a D . &nbsp7 ½ % p.a

At what rate of simple interest a certain sum will be doubled in 15 years?

Question

At what rate of simple interest a certain sum will be doubled in 15 years?

Options:

A . 5 ½ % p.a

B . 6 % p.a

C . 6 2/3 % p.a

D . 7 ½ % p.a

Answer: Option C

Let the sum be Rs. X.
Then S.I = Rs. X

= 20/3 % p.a = 6 2/3 % p.a

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