What amount of total operating income can Yuchen Company expect if units sold increase by 14% ? Assume Yuchen Company only has one style of unit that it sells. Question 17 3 pts Which of the following is/are true for contribution margin? (check all that apply) contribution margin equals revenue - variable costs - fixed costs contribution margin includes variable selling costs contribution margin will increase if variable costs per unit decrease contribution margin is always the same thing as gross profit Question 18 3 pts Which of the following is a/are product costs? (check all that apply) Rent on the administrative buildings Property taxes on manufacturing plant where the product is made Salaries of marketing employees Depreciation cost on manufacturing equipment used to make the product Direct labor