Product AA is sold for $$8$ a unit and Product BB is sold for $$12$ a unit. Each product can also be sold at the splitoff point. Product AA can be sold for $$5$ and Product BB for $$4.$ Joint costs for the two products totaled $$4,000$ for January for $600$ units of AA and $500$ units of BB$.$ What are the respective joint costs assigned to each unit of products AA and BB if the sa