Willow Manufacturing_produces 2,000 glasses per month. The following date are per unit and are based o 1,000 units produced. Direct materials 240 Direct manufacturing labor 50 Variable manufacturing overhead 60 Fixed manufacturing overhead 50 Total manufacturing costs 400 + The plant has capacity for 3,000 glasses. Plant supervisor's salary is $15,000. Required: a. What is the total cost of producing 2,000 glasses? b. What is the total cost of producing 1,600 glasses? c. What is the per unit cost when producing 1,500 glasses?