Answer: the number of copies above which company A's charges are higher of the two is 60 or more
Step-by-step explanation:
Let x represent the number of copies that made with either company's A copier or company B's copier.
Company A rent copier for a monthly charges of of $360 plus 12 cents per copy. This means that the total cost of making x copies with Company A's copier is
12x + 360
Company B rents copiers for a monthly charge of 720 plus 6 cents per copy. This means that the total cost of making x copies with Company B's copier is
6x + 720
To determine the number of copies above which company A's charges are higher of the two,
12x + 360 > 6x + 720
12x - 6x > 720 - 360
6x > 360
x > 360/6
x > 60
