A sum of money at simple interest amounts to Rs. 1072 in 2 years and to Rs. 1144 in 4 years. The sum is:	Options:
A) Rs. 1000	B) Rs. 850	C) Rs. 500	D) Rs. 1200	E) Rs. 900
S.I. for 2 years = Rs. (1144 - 1072) = Rs. 72.   S.I. for 1 year = Rs. 72/2 = Rs. 36.   Principal = Rs. (1072 - 72) = Rs. 1000.   Rs. 1000nswer: Option Rs. 1000
<result>A</result>
A sum of money at simple interest amounts to Rs. 1072 in 2 years and to Rs. 1144 in 4 years. The sum is: