A commission-paid shoe salesman must decide whether to work hard or shirk. Working hard would increase the probability of a sale from 20% to 40% but would cost him $20. If the salesman is paid a $40 commission per sale and a $20 fixed salary and is under monitoring where he would get fired if he doesn’t work hard, what would he choose to do? a. Work hard b. Shirk c. Walk away from the job d. None of the above