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

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Cosmic sells two dozen plain donuts for every dozen custard$-$filled donuts. A dozen plain donuts sells for $$3\mathrm{.}10,$ with total varial cost of $$1\mathrm{.}24$ per dozen. A dozen custard$-$fil donuts sells for $$7\mathrm{.}20,$ with total variable co of $$2\mathrm{.}88$ per dozen.

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Requirement $1.$ Calculate the weighted$-$average contribution margin. $($Round all currency amounts to the nearest cent.$)$

$\backslash$table$[[,$Plain,Filled,Total$],[$Sales price per unit,$$,{3\mathrm{.}10}^{TT}$$$,7\mathrm{.}20,],[-$ Variable cost per unit,,$1\mathrm{.}24,2\mathrm{.}88,],[$Contribution margin per unit,,${1\mathrm{.}86}^{TT},4\mathrm{.}32,],[,$ Sales mix in units,,$2^{TT},1^{TT},3],[$Contribution margin,$$,3\mathrm{.}72$$${?}^{?},{4\mathrm{.}32}^{TT},8\mathrm{.}04],[$Weighted$-$average contribution margin per unit,,,,$2\mathrm{.}68]]$

Requirement $2.$ Determine Cosmic's monthly breakeven point in dozens of plain donuts and 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.