A sum of money at simple interest amounts to Rs. 815 in 2 years and to Rs. 854 in 4 years. The sum is:  Choose the most appropriate option
A) s. 650  B) s. 690  C) s. 698  D) s. 700  E) s. 737
S.I. for 1 year = Rs. (854 - 815) = Rs. 39.   S.I. for 2 years = Rs.(39 x 2) = Rs. 78.   Principal = Rs. (815 - 78) = Rs. 737.   Answer: Option s. 737
<result>E</result>
A sum of money at simple interest amounts to Rs. 815 in 2 years and to Rs. 854 in 4 years. The sum is: