A sum of money at simple interest amounts to Rs. 825 in 3 years and to Rs. 830 in 4 years. The sum is?
Choices:
A) s. 738 B) s. 638 C) s. 650 D) s. 810 E) s. 735
S.I. for 1 year = (830 - 825) = Rs. 5   S.I. for 3 years = 5 * 3 = Rs. 15   Principal = (825 - 15) = Rs. 810.   ANSWER:s. 810
<result>D</result>
A sum of money at simple interest amounts to Rs. 825 in 3 years and to Rs. 830 in 4 years. The sum is?