just need this last part done. third time asking this question !

Her fixed expenses total $160,000. Compute Salys operating leverage tactor al an expected seles level of 1,600 quilta. If sales volume increases 4%, by what percentage wal her operating income change? Prove your answer by calculating operating income at a sales volume of 1,600 and at a sales volume of 1,664 Compute her coerating leverage factor. (Round your answer to two decinal places) Fist. identily the formula, then compute the operating leverage factor: If sales volume increases 4W, by what percentage will her operating income change? (Round twe percentage to the neacest terh perceet, XXNC) Operating income will increase by Prove your answer. (Round the percentage to the neareat tenth percent Xx.)