A good salesperson can sell $200,000 worth of goods, while a poor one can sell only a smaller amount worth of goods. Job applicants know if they are good or bad, but the firm does not. A firm will offer job applicants a choice between a fixed salary of $20,000 or a 20% commission. Assume risk-neutral salespersons and no opportunistic behavior. Given that the firm wants to distinguish a prospective good salesperson from a poor one, what should be the sales amount of a poor salesperson?