Use the following to answer questions $3-4$:

The firm's cash break$-$even point is:

a$.4,800$ units. b$.14,634$ units. c$.7,142$ units. d$.18,000$ units.

The Degree of Operating Leverage $($DOL$)$ is: a$.1\mathrm{.}58$X$.$ b$.1\mathrm{.}95$X$.$ c$.3\mathrm{.}50$X$.$ d$.1\mathrm{.}40$X$.$