The degree of leverage concept is designed to show how changes in sales affect earnings before interc and if the firm uses no debt, then what is its degrec of operating leverage?

a$.7\mathrm{.}5$

b$.0\mathrm{.}5$

c$.1\mathrm{.}5$

d$.5\mathrm{.}0$

e$.2\mathrm{.}0$