The following is a list of various costs of producing T-shirts. Classify each cost as either a variable, fixed, or mixed cost for units produced and sold. a. Ink used for screen printing b. Warehouse rent of $8,000 per month plus $0.50 per square foot of storage used C. Thread d. Electricity costs of $0.038 per kilowatt-hour e. Janitorial costs of $4,000 per month f. Advertising costs of $12,000 per month 9. Accounting salaries h. Color dyes for producing different colors of T-shirts i. Salary of the production supervisor j. Straight-line depreciation on sewing machines k. Salaries of internal pattern designers 1 Hourly wages of sewing machine operators m. Property taxes on factory, building, and equipment n. Cotton and polyester cloth o. Maintenance costs with sewing machine company (The cost is $2,000 per year plus $0.001 for each machine hour of use.)