The following is a list of various costs of producing sweatshirts. Classify each cost as either a variable, fixed or mixed cost for units produced and sold. (a) Electricity costs of $0, 025 per kilowatt-hour. (b) Warehouse rent of $6,000 per month plus $0.50 per square foot of storage used. (c) Thread. (d) Lubricants used to oil machinery. (e) Janitorial costs of $2,000 per month. (f) Advertising costs of $ 10,000 per month. (g) Sales salaries. (h) Color dyes for producing different colors of sweatshirts. (i) Salary of the production supervisor. (j) Straight-line depreciation on sewing machines. (k) Patterns for different designs. Patterns typically last many years before being replaced. (l) Maintenance costs with sewing machine company. The cost is $2,000 per year plus $0,001 for each machine hour of use. (m) Property taxes on factory, building, and equipment (n) Cotton and polyester cloth. (o) Hourly wages of sewing machine operators