A sum of money at simple interest amounts to Rs. 815 in 4 years and to Rs. 854 in 5 years. The sum is: Pick one
A) s. 650
B) s. 659
C) s. 698
D) s. 700
E) s. 720
S.I. for 1 year = Rs. (854 - 815) = Rs. 39.   S.I. for 4 years = Rs.(39 x 4) = Rs. 156.   Principal = Rs. (815 - 156) = Rs. 659.   Answer: Option s. 659
<result>B</result>
A sum of money at simple interest amounts to Rs. 815 in 4 years and to Rs. 854 in 5 years. The sum is: