Maryellen wants a job as a sales representative. She receives two job offers from companies that sell office machines to businesses. Office Essentials offers a monthly
salary of $2,500 per month plus a commission of $125 for every office machine she
sells. Everything Office offers Maryellen a salary of $2,000 per month, plus a
commission of $150 for every office machine she sells. How many office machines
would Maryellen have to sell in order for the two companies offers to be the same
monthly salary?