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Differential Analysis In each of four independent cases, the amount of differential revenue or dif- ferential cost is as follows (parentheses indicate decreases): 1 2 4 Increases (decreases) in: Revenue $18,000 $-0- ? Costs.. ? ($12,000) ? $-0- For each case, determine the missing amount that would be necessary for the net differential amount to be $8,000 b. ($4,000) a. Indicate whether your answers reflect increases or decreases