Answer:
The amount of sales in order to cover his monthly expenses must be greater than or equal to $22,500
Explanation:
Let
x----> represent the amount of sales Ollie will need
we know that
The amount of sales for the month multiplied by the commission rate as a decimal plus the fixed amount must be greater than or equal to $5,400 each month
so
The inequality that represent this situation is

solve for x
subtract 2,700 both sides


divide by 0.12 both sides

The amount of sales in order to cover his monthly expenses must be greater than or equal to $22,500