1) A mixed cost is always high proportion variable and low proportion fixed. true false 2) The contribution approach to the income statement classifies costs by behaviour rather than by function. true false MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. 3) Which costs will change with a decrease in activity within the relevant range? A) Total fixed costs and total variable costs. B) Unit fixed cost and total variable costs. c) Unit variable cost and unit fixed cost. D) Unit fixed cost and total fixed costs.