A sum of money lent out at S.I. amounts to Rs. 820 after 2 years and to Rs. 1020 after a further period of 5 years. The sum is?  Choose the correct choice from the following answers:
A) Rs.440
B) Rs. 500
C) Rs. 540
D) Rs. 740
E) Rs. 840
S.I for 5 years = (1020 - 820) = Rs. 200.   S.I. for 2 years = 200/5 * 2 = Rs. 80.   Principal = (820 - 80) = Rs. 740.   ANSWER:Rs. 740
<result>D</result>
A sum of money lent out at S.I. amounts to Rs. 820 after 2 years and to Rs. 1020 after a further period of 5 years. The sum is?