Differential Analysis In each of four independent cases, the amount of differential revenue or differential cost is as follows (parentheses indicate decreases): Increases (decreases) in: Revenue Costs 7 $18,000 $0 ? ? ? $(12,000) $0 For each case, determine the missing amount that would be necessary for the net differential amount to be: a. $10,000 Use a negative signs with answers to reflect decreases. 1 Increases (decreases) in: Revenue 0 $18,000 0 $ 0 $ ${12.000 Costs 0 $0 b. ($6,000) Use a negative signs with answers to reflect decreases. 2 4 Increases (decreases) in: Revenue Costs $0 $ 0 $18,000 0$ 0 $ ${12,000) $ 0 Check