Simple Interest 54Q

54.	What is the rate of simple interest? I.  The total interest earned was Rs. 4000.  II.  The sum was invested for 4 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 D

Explanation:

We know that, R =		100 x S.I.
		P x T

Now, I gives, S.I. = Rs. 4000.

II gives, T = 4 years.

But, P is unknown. So, we cannot find R.

So, given data is insufficient to get R.

                        Correct answer is (D).