Cameron works in a department store selling clothing. He makes a guaranteed salary of $200 per week, but is paid a commision on top of his
base salary equal to 5% of his total sales for the week. How much would
Cameron make in a week in which he made $1400 in sales? How much would
Cameron make in a week if he made a dollars in sales?

Total earning when selling $1400:

total earnings when selling $x