Suppose that a company that makes sweatshirts has a linear demand function of qD = –6p + 400 and a linear supply function of qS = 4p + 50, where p is the price of each sweatshirt and q is the quantity, or number of sweatshirts.  How many sweatshirts are made and sold if the market is in equilibrium?  (i.e., What is the equilibrium demand?)  ? sweatshirts

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A: Please refer to the image below