Honest Charlenes Auto Dealer purchases used cars at auto auctions and sells them retail. The autos, on average, sell for approximately $$20,000$ each and cost Charlene $$13,500.$ The costs that the company incurs in a typical month are listed below:Costs Cost FormulaSelling:Advertising $$3,900$ per monthPreparation of Autos for Delivery$ $900$ per auto soldSales salaries & commissions $$4,100$ per month, plus $7\%$ of salesUtilities $($same every month$)$ $$5,200$ per monthDepreciation on sales facility $$4,500$ per monthAdministrative:Executive salaries $$12,800$ per monthDepreciation on office equipment $$2,200$ per month