A sum of money becomes Rs 13,380 in 3 years and Rs 20,070 in 6 years at compound interest. The initial sum is?	Pick one
A) Rs 8927  B) Rs 8922  C) Rs 89298  D) Rs 8920  E) Rs 8921
Use the formula Amount = Principal Amount(1 + R/100)n   Where r is rate and t is time in years   =&gt;13,380 = P(1+R/100)2 --(1)   =&gt;20,070 = P(1+R/100)6 --(2)   =&gt; 1.5 = (1+R/100)4   =&gt; P = Rs 8920   ANSWER:Rs 8920
<result>D</result>
A sum of money becomes Rs 13,380 in 3 years and Rs 20,070 in 6 years at compound interest. The initial sum is?