Answer :
Answer:
Firm A can sell 30 permits as it has an excess of 30 permits.
Explanation:
As the permits are reduced by 10%, then the permits issued to Firm A after one year will be,
Permits issued - After one year = 800 * (1 - 10%) = 720 permits
Now as Firm A has reduced its pollutant units to 690 units, which is more than the permits issued to it, it has an excess of 30 permits.
Excess = 720 - 690 = 30 permits
Firm A can sell these permits after one year.