Question one 1- The Singer Company manufactures several different products. Costs associated with 10,000 units of Product X are as follows: Direct materials $ 60,000 Direct manufacturing labor 10,000 Variable manufacturing overhead 18,000 Fixed manufacturing overhead 32,000 Sales commissions (2% of sales) 4,000 Administrative salaries 16,000 Revenues 200,000 Required: a) What are the variable costs? b) What are the fixed costs? c) What are the inventoriable costs? d) What are the period costs? c) Calculate gross margin? f) Calculate operating income