The compound interest earned on a sum for the second and the third years are $1200 and $1260 respectively. What is the rate of interest?	Choose the correct choice from the following choices:
A) 5 %
B) 8 %
C) 11 %
D) 14 %
E) 18 %

Rationale: "1260 - 1200 = 60 is the rate of interest on $ 1200 for one year . the rate of interest = ( 100 * 60 ) / ( 1200 ) = 5 % the answer is a ."
Answer: A