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Profit and Loss - General Aptitude

Q1:

A man mixes two types of rice (X and Y) and sells the mixture at the rate of Rs. 17 per kg. Find his profit percentage.
I.  The rate of X is Rs. 20 per kg.
 II.  The rate of Y is Rs. 13 per kg.

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

ANS:D - Both I and II are not sufficient to answer

The ratio, in which X and Y are mixed, is not given. So, both I and II together cannot give the answer.  Correct answer is (D).