Which of the following terms describes the cost behaviour represented in the plot of data below: fixed, variable, step, variable rate constant as activity increases, variable rate increasing as activity increases, variable rate decreasing as activity increases, mixed? More than one of these terms may apply. In your answer, list only the terms that apply and explain briefly why they apply to this cost behaviour. (Each dot represents one observation.)

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$90 80 70 60 50 40 30 20 10 20 40 60 80 100 120 140 Activity Total Cost