To estimate the monthly maintenance cost for the maintenance department in a hospital, the following monthly costs are available: Monthly Expense Supervisor Salary Expense Depreciation Expense Maintenance Equipment Repairs Expense Maintenance Equipment Supplies Expense Wages Expense-Maintenance Workers Costs $3,000 $5,000 $5,000 $7,000 $10,000 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. Show your calculations.