A sum of money at simple interest amounts to Rs. 824 in 3 years and to Rs. 854 in 4 years. The sum is:  Choose the most appropriate option.
A) 500
B) 698
C) 780
D) 910
E) 725
Sol.   S.I. for 1 year = Rs. (854 - 824) = Rs. 30.   S.I. for 3 years = Rs. (30 * 3) = Rs. 90.   âˆ´ Principal = Rs. (815 - 90) = Rs. 725   Answer 725
<result>E</result>
A sum of money at simple interest amounts to Rs. 824 in 3 years and to Rs. 854 in 4 years. The sum is: