Question $23(1$ point$)$Contribution Margin divided by Sales $($Contribution Margin$/$Sales$)$ is the equation for what formula?$1518--21--24--$Question $24(1$ point$)$What is the name of costs that differ between periods?RelevantIrrelevantQuestion $25(1$ point$)$There are three steps to decision making, Execution, Evaluation and what $($not necessarily listed in order here$)?$