A sum of money at simple interest amounts to Rs. 800 in 3 years and to Rs. 850 in 4 years. The sum is:
Choose the correct option
A) Rs. 670	B) Rs. 690	C) Rs. 600	D) Rs. 625	E) Rs. 657
Explanation:   S.I. for 1 year = Rs. (850 - 800) = Rs. 50.   S.I. for 3 years = Rs.(50 x 3) = Rs. 150.   Principal = Rs. (800 - 150) = Rs. 600.   Answer: Option Rs. 600
<result>C</result>
A sum of money at simple interest amounts to Rs. 800 in 3 years and to Rs. 850 in 4 years. The sum is: