An online provider of house cleaning services trains its cleaning staff to follow protocols designed for each service to ensure consistency in the delivery of its services. At the end of every month, five members of the active cleaning crews leave the job. To fill those vacancies, every two months the online provider conducts onboarding sessions to add 10 new workers to its cleaning staff. The onboarding sessions take one week to complete and have a fixed cost of $2,000 (independent of the number of workers being trained). After completing their training, workers are on call, receiving a placeholder fee while they wait for a full-time spot to open in one of the cleaning crews. The annual cost of an on-call worker is $500