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 4 years. The sum is?
Choose the correct choice from the following answers:
A) s.440
B) s. 500
C) s. 720
D) s. 740
E) s. 840
S.I for 5 years = (1020 - 820) = Rs. 200.   S.I. for 2 years = 200/4 * 2 = Rs. 100.   Principal = (820 - 100) = Rs. 720.   ANSWER:s. 720
<result>C</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 4 years. The sum is?