The following is a list of various costs of producing shirts. Classify each cost as either a 1. variable, fixed, or mixed cost for units produced and sold Hourly wages of sewing machine operators. (a) Warehouse rent of $8,000 per month (b) Electricity costs of $0.049 per kilowatt-hour (c) (d) Salary of the production supervisor (e) Property taxes on factory, building, and equipment. (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. Sales commissions of $6,000 plus $0.05 for each item sold (i) Straight-lne depreciation on sewing machines. (j) (k) Buttons for the shirts. Maintenance costs with sewing machine company (l) each machine hour of use. the cost is $2,000 per year plus $0.001 for