Manufacturing statements and cost behavior
Tampa Foundry began operations during the current year, manufacturing  various products for industrial use. One such product is light-gauge  aluminum, which the company sells for $36 per roll. Cost information for  the year just ended follows.
| Per Unit  | Variable Cost  | Fixed Cost  | 
| Direct materials | $4.50 | $ - | 
| Direct labor | 6.5 | - | 
| Factory overhead | 9 | 50,000 | 
| Selling | - | 70,000 | 
| Administrative | - | 135,000 | 
                               
 
Production and sales totaled 20,000 rolls and 17,000 rolls,  respectively There is no work in process. Tampa carries its finished  goods inventory at the average unit cost of production.
 
Instructions: 
a.       Determine the cost of the finished goods inventory of light-gauge aluminum.
b.      Prepare an income statement for the current year ended December 31
c.       On the basis of the information presented:
 
1.      Does it appear that the company pays commissions to its sales staff? Explain.
2.      What is the likely effect on the $4.50 unit cost of direct materials if next year's production increases? Why?