HI$!$ I ONLY NEED HELP SOLVING REQUIREMENT $3.$ "INCREMENTAL MANUFACTURING COST". THANK YOU! Required information

$[$The following information applies to the questions displayed below.$]$

Kubin Company's relevant range of production is $25,000$ to $33,500$ units. When it produces and sells $29,250$ units, its average costs per unit are as follows:

$\backslash$table$[[,$Average$],[,$Cost per$],[$Unit$,],[$Direct materials,$$8\mathrm{.}50$