The Central Valley Company is a manufacturing firm that produces and sells a single product. The company's revenues and expenses for the last four months are given below.

Central Valley Company

Comparative Income Statement

Sales in units

Sales revenue

Less: cost of goods sold

Gross margin

Less: Operating expenses

Shipping expense

Advertising expense

Salaries and commissions

Insurance expense

Amortization expense

Total operating expenses

Net income

April

5,400

$ 718, 200

381,600

336,600

4,900

$ 651,700

351,918

$ 299,782

May

5,850

$ 778,050

404,586

373,464

6,800

$ 904, 400

461, 244

443,156

62,300

55, 200

65,800

76,000

75.000

162,000

76,000

141,000

163,506

11,000

11,000

11,000

44,000

44,00@

44,000

$ 355,300

$ 327,200

$ 360,300 $ 378,500

$ (18,700)

$ (27,418) $ 13,164

$ 64,656

Required:

1. Management is concerned about the losses experienced during the spring and would like to know more about the cost behaviour.

Develop a cost equation for each of the costs. (Do not round intermediate calculations. Round "Per Unit answers to 2 decimal places.)

Cost of goods sold

Shipping

Salaries & commission

per unit per unit per unit