Suppose that the market demand curve for a good is given by   D=80-2P-2I, where D is the quantity demanded, P is the price of the good, and I is consumer income in thousands of dollars.  The good is a divisible good.  The supply curve is given by S = 3P, where S is the quantity supplied.  Assume that I = 15.       (a) (10 points) How many units of the good are demanded with P = $4?     (b) (10 points) Compute the size of a consumer surplus at P = $4.

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