Salespeople at a certain car dealership are paid a $250 commission on every car they sell up to their monthly quota, and $500 for every car they sell over the quota. What is the monthly sales quota at this dealership? (1) One salesperson exceeded the quota by 8 cars and received a total monthly commission of $7,500. (2) One salesperson achieved only half of the quota; he received a commission of $1,750 and a warning that he will be fired unless he meets the next month's quota.