The government has recently introduced a marketable permit program for major polluters where one permit gives permission to pollute one unit. When the program is introduced, Firm A emits 800 units of pollutant and so is granted 800 permits. After one year, firms are issued 10% fewer pollution permits. If Firm A reduces its pollutants from 800 units to 670 units, how many permits does it sell after one year? Provide your answer below