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Solve the problem. Supply and demand functions, S(X) and D(X), are given for a particular commodity in terms of the level of production X. In each case: S(x) = 4x + 250 and D(X) = -6x + 480 a. For what values of X is there a market shortage? b. For what values of X is there a market surplus? O a. 0 23 O a. 0 342 O a. x> 23; b. 0 342; b. 0