A sum of money at simple interest amounts to Rs. 845 in 3 years and to Rs. 854 in 4 years. The sum is: Choose the correct choice from the following
A) s. 650
B) s. 690
C) s. 698
D) s. 700
E) s. 728
S.I. for 1 year = Rs. (854 - 815) = Rs. 39.   S.I. for 3 years = Rs.(39 x 3) = Rs. 117.   Principal = Rs. (845 - 117) = Rs. 728.   Answer: Option s. 728
<result>E</result>
A sum of money at simple interest amounts to Rs. 845 in 3 years and to Rs. 854 in 4 years. The sum is: