Suppose Sandy sales 1,000 posters. Her average sale price is $32 and her average cost for posters is $12. her fixed expenses total $12,000 Compute her operating leverage factor. If sales volume increase 4%. What chart percentage will her operating income change? Prove your answer. (Your answer should be two decimal places). Formula: Contribution Margin / Operating Income. If sales volume increase 4%, by what percentage will her operating income change? (Round the percentage to nearest percent)