A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is?  Choose the correct answer.
A) 299	B) 217	C) 698	D) 277	E) 161
S.I. for 1 year = (854 - 815) = Rs. 39   S.I. for 3 years = 39 * 3 = Rs. 117   Principal = (815 - 117) = Rs. 698.Answer:698
<result>C</result>
A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is?