You are hired to manage an established FBO. Among the employees under your supervision is a salaried accounts receivable clerk whose duties include maintaining the accounts receivable ledger and routinely billing customers for aircraft rentals, flight instruction, hangar rental, tie-down rental, fuel and maintenance. Billing is done monthly, and the clerk prefers to work 12-16 hour days for a week to get the bills out, then take several days off to catch up on personal tasks before returning to work to accomplish her other duties. She was one of the company's first employees when it began doing business 15 years ago. The company has always permitted her to work this way. She has never requested or been offered overtime pay. She states that she much prefers the time off instead of money. Is this an acceptable practice? Explain