Scenario $2$ Because the work is so challenging, fi ve people leave their MO job at the end of every month. To fi ll those vacancies, MO conducts training sessions to add $10$ new workers to its frontline staff every two months. The training sessions take one week to complete and have a fixed cost of $$2,000$ no matter how many new hires are being trained. After completing their training, workers are on call and assigned to part$-$time duties while they wait for a full$-$time spot to open. Management at MO has estimated that each on$-$call worker costs $$7,500$ annually