A sum of money at simple interest amounts to Rs. 2240 in 2 years and to Rs. 2600 in 5 years. The sum is:
Pick one
A) Rs. 1500 B) Rs. 2000 C) Rs. 1000 D) Rs. 1200 E) Rs. 1800
S.I. for 3 years = Rs. (2600 - 2240) = Rs. 360.   S.I. for 1 year = Rs. 360/3 = Rs. 120.   S.I. for 2 years = Rs. (120 x 2) = Rs.240.   Principal = Rs. (2240 - 240) = Rs. 2000.   Answer: Option Rs. 2000
<result>B</result>
A sum of money at simple interest amounts to Rs. 2240 in 2 years and to Rs. 2600 in 5 years. The sum is: