Q 24.30: Bella Beauty had a 15% increase in sales in the cosmetics division over the last year while all fixed costs remained unchanged. Which of the following would be true? Select all that apply. A The controllable margin would increase by 15%. B Traceable fixed costs would increase by 15%. The contribution margin would decrease by 15%. Revenues would increase 15%. Variable costs would increase by 15% of the controllable margin. The contribution margin would increase by 15%. D E