D and E are midpoints of sides AB and CB， respectively.

　　Since we do not even know whether BF is an altitude， nothing can be determined from 。 More importantly， there is no information telling us the absolute size of the triangle.

　　As to ， although from geometry we know that DE = AC/2， this relationship　holds for any size triangle. Hence， is also insufficient.

　　Together， and are also insufficient since we still dont have information about the size of the triangle， so we cant determine the perimeter. The answer is E.

　　3. A dress was initially listed at a price that would have given the store a　profit of 20 percent of the wholesale cost. What was the wholesale cost of　the dress?

　　 After reducing the asking price by 10 percent， the dress sold for a net　profit of 10 dollars.

　　 The dress sold for 50 dollars.

　　Consider just the question setup. Since the store would have made a profit of 20 percent on the wholesale cost， the original price P of the dress was 120 percent of the cost： P = 1.2C. Now， translating sintosan equation yields：

　　P - .1P = C + 10

　　Simplifying gives

　　9P = C + 10

　　Solving for P yields

　　P = /.9

　　Plugging this expression for PsintosP = 1.2C gives

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