The contribution margin income statement of Trepani Donuts for August $2024$ follows:

$($Click the icon to view the contribution margin income statement.$)$

Trepani sells five dozen plain donuts for every two dozen custard$-$filled donuts. A dozen plain donuts sells for $$4\mathrm{.}00,$ with total variable cost of $$1\mathrm{.}80$ per dozen. A dozen custard$-$filled donuts sells for $$6\mathrm{.}80,$ with total variable cost of $$3\mathrm{.}06$ per dozen.

Read the requirements.

Determine Trepani's monthly breakeven point in dozens of plain donuts and custard$-$filled donuts.

The breakeven point is dozen plain donuts and dozen custard$-$filled donuts.

Prove your answer by preparing a summary contribution margin income statement at the breakeven level of sales. Show only two categories of costs: variable and fixed. $($Enter a $"0"$ for any zero balances.$)$

$\backslash$table$[[$Contri$,\backslash$table$[[$repani$],[$Margin$]],$Stater,$],[,$Plain,Filled,Total$],[$Net Sales Revenue,,,$],[$Variable Costs,,,$],[$Contribution Margin,,,$],[$Fixed Costs,,,$],[$Operating Income,,,$]]\backslash$end$\{$array$\}]$

Requirement $4.$ Compute the degree of operating leverage for Trepani Donuts. Estimate the new operating income if total sales increase by $30\%.($Round the degree of operating leverage to four decimal places and the final answer to the nearest dollar. Assume the sales mix remains unchanged.$)$