Chillicothe Meat Company produces one of the best sausage products in southern Ohio. The company's controller used the account-classification method to compile the following information. Depreciation schedules revealed that monthly depreciation on buildings and equipment is $19,000. Inspection of several invoices from meat packers indicated that meat costs the company $1.10 per pound of sausage produced. Wage records showed that compensation for production employees costs $.70 per pound of sausage produced. Payroll records showed that supervisory salaries total $10,000 per month. Utility bills revealed that the company incurs utility costs of $4,000 per month plus $.20 per pound of sausage produced. Classify each cost item as variable, fixed, or semi variable. Write a cost formula to express the cost behavior of the firm's production costs. (Use the formula Y = a + bX. where Y denotes production cost and X denotes quantity of sausage produced.)