Let the cost price be 100; according to statement II, a 20 percent profit means the marked price is 120. Statement I states a 5 percent discount is given on this list price, so the selling price becomes 95 percent of 120, which equals 114. The profit is 114 minus 100, equaling 14; applying the profit percentage formula confirms a 14 percent profit. Since the cost price was assumed as a base value of 100, the actual cost price in statement III is not required to find the percentage; therefore, only statements I and II are necessary.