Suppose that you work part-time as a sales representative at a car dealership. you earn a base salary of $125 per week plus an 18% commission on all sales that you make. your best friend has exactly the same job at another car dealership but earning a base salary of $85 per week plus a 21% commission on all sales. how much do you and your
friend need to sell in order to earn the same amount in any given week?