The Service DepartmentThis department has two sources of work: the work needed to satisfy the guarantees for the Sales Department and repair work for external customers. Customers are charged at full cost plus 40%. The details of the budget for the next year for the Service Department revealed standard costs of:Parts at costLabour $15 per hourVariable overheads $10 per labour hourFixed overheads $22 per labour hour The calculation of these standards is based on the estimated maximum market demand and includes the expected 500 repairs for the Sales Department. The average cost of the parts needed for a repair is $54. This means that the charge to the Sales Department for the repair work, including the 40% mark-up, will be $136,500.