If revenues are $315,000 under alternative A and $324,000 under alternative B, and costs are $285,000 for A and $306,000 for B, then using the basic approach in incremental analysis, incremental revenues, costs, and net income, in comparing B to A are respectively $9,000,$21,000,$12,000$(9,000),$21,000,$12,000$9,000,$(21,000),$(12,000)$(9,000),$(21,000),$(12,000)