tammy earns $18000 salary with 4% comission on sales. How much should she sell to earn $55,000 total

tammy earns $18000 salary with 4% comission on sales. How much should she sell to earn $55,000 total

We have a commission equation below:
Sales * Commission percent = Salary

We're given 4% commission percent and 55,000 salary. With 4% as 0.04, we have:
Sales * 0.04 = 55,000

Divide each side of the equation by 0.04, and we get:
Sales = 1,375,000