A sum is invested for 3 years compounded at 5%, 10% and 20 % respectively. In three years, if the sum amounts to Rs. 1386, then find the sum.  Pick one:  A) Rs. 1500  B) Rs. 1000  C) Rs. 1200  D) Rs. 1400  E) Rs. 1600
Explanation:   1386 = P(1+5/100)(1+10/100)(1+20/100)   1386 = P(21/20)(11/10)(6/5)   P = (1386 × 20 × 10 × 5)/(21 × 11 × 6) = (66 × 20 × 10 × 5)/(11 × 6 = 20 × 10 × 5) = Rs. 1000   i.e., the sum is Rs.1000   Answer: Option Rs. 1000
<result>B</result>
A sum is invested for 3 years compounded at 5%, 10% and 20 % respectively. In three years, if the sum amounts to Rs. 1386, then find the sum.