=+E10-1 Classify costs as materials, labor, or factory overhead Obj 2 Indicate whether each ofthe following costs of an airplane manufacturer would be classified as direct materials cost, direct labor cost, or factory overhead cost:

a. Steel used in landing gear

b. Controls for flight deck

c. Welding machinery lubricants

d. Salary oftest pilot

e. Wages of assembly line worker

f. Tires g. Aircraft engines h. Depreciation ofwelding equipment