Differential Analysis In each of four independent cases, the amount of differential revenue or differential cost is as follows (parentheses indicate decreases) 2 Increases (decreases) in: Revenue Costs $19,000 $0 ?$(11,000) $0 For each case, determine the missing amount that would be necessary for the net differential amount to a. $10,000 Use a negative signs with answers to reflect decreases 2 3 4 Increases (decreases) in: Revenue $19,000 $0 21,000 $ 10,000 Costs (9,000) X (10,000) $(11,000) $0 b. ($7,000) Use a negative signs with answers to reflect decreases 2 3 4 Increases (decreases) in: Revenue $19,000 $0 4,000 $ (57,000) X Costs $(26,000) X(7,000) X $(11,000) $0