A sum of money at simple interest amount to Rs 720 after 2 years and to Rs 1020 after a further period of 5 years.The sum is:	Pick one:
A) 600
B) 450
C) 650
D) 500
E) 550
Simple Interest for 5 year = Rs.(1020 - 720) = Rs. 300.   Simple Interest for 2 year = Rs.(300/5×2) = Rs. 120.   Principal = Rs. (720 - 120) = Rs. 600.   600NSWER : 600
<result>A</result>
A sum of money at simple interest amount to Rs 720 after 2 years and to Rs 1020 after a further period of 5 years.The sum is: