Compound interest earned on a sum for the second and the third years are Rs.12500 and Rs.14000 respectively. Find the rate of interest?	Options:  A) 18% p.a.  B) 22% p.a.  C) 20% p.a.  D) 12% p.a.  E) None of these.
Rs.14000 - 12500 = Rs.1500 is the interest on Rs.12500 for one year.   Rate of interest = (1500/12500) * 100= 
<gadget id="calculator">(1500/12500) * 100</gadget>
<output>12</output>
12% p.a   ANSWER:12% p.a.
<result>D</result>
Compound interest earned on a sum for the second and the third years are Rs.12500 and Rs.14000 respectively. Find the rate of interest?