14-20 Customer profitability, service company. Instant Service (IS) repairs printers and photocopiers for five multisite companies in a tristate area. IS's costs consist of the cost of technicians and equipment that are directly traceable to the customer site and a pool of office overhead. Until recently, IS estimated customer profitability by allocating the office overhead to each customer based on share of revenues. For 2017, IS reported the following results: