2. Suppose there are two sources (i.e., A and B) of C02 emission in the economy for a given year and the total abatement cost (TAC) for the two sources of pollution are given respectively as: TACA = 400 ZA + (Zn)2 TACB = 200 ZB + 3 (23)2 where TACA and ZA are respectively the total abatement cost and amount of C02 abated by source A and TACB and 22 are respectively abatement cost and amount of C02 abated by source B. Assume that out of the 240 tones of uncontrolled C02 emission (i.e., 120 tones each), now the authorities set a total CO2 control target of 100 tones by both firms