A sum of money lent out at simple interest amounts to 720 Rs. after 2 years and to 1020 Rs. after a further period of 5 years. The sum is :
[A] 500 Rs.
[B] 600 Rs.
[C] 700 Rs.
[D] 710 Rs.

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This question is part of UPSC Prelims Practice and Mock Tests membership programme.