a$.$ For each operating struchure calculate

$*$EBIT and EPS at $20,000$ and $30,000$ units.

$*$The degree of operating leverage $($DOL$)$ and degree of total leverage $($DTL$)$using $20,000$ units as a base sales level.

$*$The operating breakeven point in units.

b$.$ Which operating structure has greater operating leverage and business risk? If Silver projects sales of $20,000$ units, which operating structure is recommended?