If the ratio of principal and yearly amount be in the ratio 25 : 28, then the yearly rate of interest is-

A 3%

B 12%

C 10(5/7)%

D 8%

Correct Answer: Option B

মনে করি ,আসল 25x
এবং সুদাসল =28x
অতএব , সুদ =28x-25x=3x
অতএব , শতকরা =3x/25x x100%=12%