uppose that two firms, X and Y. face the following marginal abatement costs (MAC and MAC) and total abatement costs (TACx and TAC) which depend on the amount of abatement each performs (Ax and Ay ugaview.usg.edu $5.00 $8.00 John Di Attempt 1 $9.60 Assume that the combined abatement standard for both firms is 40 units. In other words, Ax+ Ay=40. Question 7 (1 point) O MACY-0.3Ay TACY-0.154,² To achieve this standard (40 total units of abatement), the government imposes an emission charge as a unit tax. What unit tax would achieve this standard?