Case 1 (5Marks) Castle Service repairs printers and photocopiers for frve customers. Castle'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, Castle estimated customer profitability by allocating the office overhead to each customer based on share of revenues. For 2020, Castle reported Nasser, Castle's new controller, notes that office overhead is more than 10% of total costs, so she spends a couple of weeks analysing the consumption of office overhead resources by customers. She collects the following information: Required Compute gathered