The monthly costs ($) of producing various amounts of a particular item (units) are shown. units 3000 4500 6000 cost 105500 140750 176000 a. What is the monthly fixed cost? Include units. b. What is the production cost (variable cost) for each unit produced? Include units. c. What is the cost of producing 5000 units monthly? Include units. 1/year d. What is the rate of change of the cost when producing 5000 units monthly? Include units. 1/year