Breakeven point$-$Algebraic and graphical Fine Leather Enterprises sells its single product for $$128\mathrm{.}55$ per unit. The firm's fixed operating costs are $$473,400$ annually, and its variable operating costs are $$85\mathrm{.}81$ per unit.

a$.$ Find the firm's operating breakeven point in units.

b$.$ Label the $x$ axis "Sales $($units$)"$ and the y axis "Costs$/$Revenues $($$$),"$ and then graph the firm's sales revenue, total operating cost, and fixed operating cost functions on these axes. In addition, label the operating breakeven point and the areas of loss and profit $($EBIT$).$