The data given in the question are C.P. and discount%. Using statement I alone, as the marked price of the article is given and discount% is known, we can find the selling price of the article. We can find the profit using cost price and the selling price of the article. Statement II, as X’s SP and his profit% are known, we can find X’s CP. Which is trader’s SP also. Now, since, we have both trader’s CP and SP, we can get the Profit.. Hence, statement II alone is also sufficient.