To estimate the monthly maintenance cost for the maintenance department in a hospital, the following monthly costs are available: The Supervisor Salary Expense and the Depreciation Expense are fixed costs. The remaining expenses are variable costs. There are 1,000 patient days in a month, which is the cost driver for maintenance costs. Estimate the cost function where Y is the monthly maintenance cost and X is the variable cost per patient day. Y=$8,000+$22XY=$8+$22XY=$8,000+$22,000XY=$30,000+$22,000X