Kevin works as a salesperson at a store that specializes in custom made computers. He earns a base pay of 325$ per week and a commission on his sales. If Kevin earned a total of $1125 last week, how much of it was commissions

Answer:
Kevin made $800 in commissions last week.

Explanation:
Since we know that he only makes money in two ways, by base salary and commission, we know that added together they equal his whole pay.

Therefore we can set up the following equation and solve for his commission amount.
Total Pay = Base Pay + Commissions.
1125 = 325 + Commissions.
800 = Comissions.