NoFly Corporation sells three different models of a mosquito

$$zapper$.$ Model A$12$ sells for $$55$and has variable costs of

$$36.$ Model B$22$ sells for $$102$and has variable costs of $$75.$

Model C$124$ sells for $$412$and has variable costs of $$321.$ The

sales mix of the three models is A$12,58\%$; B$22,26\%$; and

C$124,16\%.$What is the weighted$-$average unit contribution

margin?$($Round answer to $2$ decimal places, e$.$g$.$

$15\mathrm{.}50.)?($enter the weighted$-$average unit contribution margin in

dollars rounded to $2$ decimal places $)$