A sum of money at simple interest amounts to Rs. 1717 in 1 year and to Rs. 1734 in 2 years. The sum is:  Choose the correct choice from the following answers:	A) Rs. 1200	B) Rs. 1690	C) Rs. 1600	D) Rs. 1700	E) Rs. 1500
S.I. for 1 year = Rs. (1734 - 1717) = Rs. 17.   Principal = Rs. (1717 - 17) = Rs. 1700.   Answer: Option Rs. 1700
<result>D</result>
A sum of money at simple interest amounts to Rs. 1717 in 1 year and to Rs. 1734 in 2 years. The sum is: