Simple Interest 50Q

50.	What is the sum which earned interest? I.  The total simple interest was Rs. 7000 after 7 years.  II.  The total of sum and simple interest was double of the sum after 5 years.
	A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer E. Both I and II are necessary to answer

Answer: Option E

Explanation:

Let the sum be Rs. x.

I gives, S.I. = Rs. 7000 and T = 7 years.

II gives, Sum + S.I. for 5 years = 2 x Sum           Sum = S.I. for 5 years.

Now, S.I. for 7 years = Rs. 7000.

S.I. for 1 year = Rs.	7000	= Rs. 1000.
	7

Thus, I and II both are needed to get the answer.

 Correct answer is (E).