The Clean Air Act (CAA) of 1970 did all of the following except . establish the National Ambient Air Quality Standards (NAAQS)

introduce motor vehicle emissions controls

create State Improvement Plans (SIP) to promote better air quality

reduce the federal government's enforcement authority

Aaron corporation, which has only one product, has provided the following data concerning its most recent month of operations: selling price $ 102 units in beginning inventory 0 units produced 4,900 units sold 4,260 units in ending inventory 640 variable costs per unit: direct materials $ 20 direct labor $ 41 variable manufacturing overhead $ 5 variable selling and administrative expense $ 4 fixed costs: fixed manufacturing overhead $ 64,200 fixed selling and administrative expense $ 2,900 the total contribution margin for the month under variable costing is: