A person got Rs.55 more when he invested a certain sum at compound interest instead of simple interest for two years at 9% p.a. Find the sum?  Choose the most appropriate option:
A) 6790
B) 6890
C) 6700
D) 2667
E) 2671
P = (d * 1002) / R2   =&gt; (55 * 100 * 100) / 9 * 9 = Rs.6790   6790nswer:6790
<result>A</result>
A person got Rs.55 more when he invested a certain sum at compound interest instead of simple interest for two years at 9% p.a. Find the sum?