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) Lubricants used to oil machinery. - (b) Warehouse rent of $6,000 per month plus $.50 per square foot of storage used. - (c) Thread. - (d) Electricity costs of $.025 per kilowatt-hour. - (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) 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 $.001 for each machine hour of use. -