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Write whether the following costs can be described as fixed, variable, semi variable or step cost for the manufacturer of a wooden desk. a. Wood $3.00 per desk b. Factory labor paid at a rate of $5.00 per desk c. Rent for the factory $5,000 per month d. Cardboard boxes for delivery of desks to customers $5.00 per desk e. Con Edison electric paid at a rate of $600 per month plus $1.00 per kilowatt hour f. Insurance paid monthly at $1600 per month . g. Factory supervisor's salary of \$12,000 per month an additional supervisor is needed for every shift and the company has gone from one to three shifts per day h. Varnish and paint for each desk at a cost of $1.00 per desk i. Security for the factory of $5,000 per month j. Depreciation of factory equipment-straight line of $2,000 per month k. Quality control inspectors' salaries of $9,000 per month