EXERCISE 1-14. Opportunity Costs [LO 2] Parrish Plumbing provides plumbing services to res- idential customers from Monday through Friday. Ken Parrish, the owner, believes that it is im- portant for his employees to have Saturday and Sunday off to spend with their families. However he also recognizes that this policy has implications for profitability, and he is considering staying open on Saturday unerently circular for a manufacturing firm