What Information do I need to find Cost of sales?

Sales		$ 1,743,419.02
Cost of Goods Sold		$ 1,309,505.55
Gross Margin		$ 433,913.47
Selling and Administrative Expenses
Salaries		$ 245,877.50
Vehicle and Travel		$ 21,197.83
Advertising		$ -
Legal and Audit		$ 8,542.10
Telephone and postage		$ 18,030.85
Office		$ 10,388.56
Interest and bank charges		$ 10,325.69
Dues, fees and capital tax		$ 5,525.45
Donations		$ 576.92
Bad Debts		$ 24,328.24
Amortization - office equipment		$ 4,339.10
Amortization - vehicles		$ 9,249.04
Misc. Expenses		$ -
Cost of Sales		$ 75,532.19

Sales 1,743,419.02

Purchases 539,633.45

Wages 503,002.96

WIP inventory 6,203.94

Duty & Brokerage 3,869.85

Freight 27,749.14

Heat & light 18,012.57

Factory repairs 40,888.34

Insurance 15,966.93

Municipal taxes 20,033.82

Union dues 16,673.86

Canada pension plan 11,611.57

Workers compensation 26,780.16

Employer health tax 38,651.75

Amortization production equipment 32,118.72

Amortization building 8,308.49

Salaries 245,877.50

Gasoline 21,197.83

Advertising 0

Legal 8,542.10

Telephone 18,030.85

Mortgage interest 8,633.52

Office 10,388.56

Bank charges 1,692.17

Due & fees 5,525.45

Donations 576.92

Bad debts 24,328.24

Amortization office 4,339.10

Amortization corporate fleet 9,249.04

Rent -3,301.05

Income tax provision current 26,333.24