the total revenue equals total cost.

The _________ is the point at which the total revenue equals total cost.(a) break-even point(b) fixed cost solution(c) optimal profit point(d) zero-profit solutionProbabilities for all the possible values of a discrete random variable:(a) may be greater than one.(b) may be negative on some occasions.(c) must sum up to one.(d) are represented by the area under the curve

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