1. The following is a list of various costs of producing shirts. Classify each cost as either a variable, fixed, or mixed cost for units produced and sold.

(a) Hourly wages of sewing machine operators (b) Warehouse rent of $8,000 per month. (c) Electricity costs of $0.049 per kilowatt-hour. (d) Salary of the production supervisor. (e) Property taxes on factory, building, and cquipment. (f) Salary of the night-time security guard of $3,800 per month (g) Cotton and polyester cloth (h) Advertising costs of $12,000 per month. (i) Sales commissions of $6,000 plus $0.05 for each item sold. G) Straight-line depreciation on sewing machines. (k) Buttons for the shirts. ) Maintenance costs with sewing machine company-the cost is $2,000 per year plus S0.001 for each machine hour of use