EA 4 - Which of these costs are variable product costs? Select all that apply. 多项选择题

Lumber used to construct decks ($12.00 per square foot)

Carpenter labor used to construct decks ($10 per hour)

Construction supervisor salary ($45,000 per year)

Depreciation on tools and equipment ($6,000 per year)

Selling and administrative expenses ($35,000 per year)

Rent on corporate office space ($34,000 per year)

Nails, glue, and other materials required to construct deck (varies per job)