Office Supplies Only store costs are expressed as a function of the unit sales of its two products: office chairs and task desks. Assume fixed costs are $$9,000$ per month and the variable costs are $$60$ per office chair and $$125$ per task desk.What are Office Supplies Only's estimated costs for the month if $100$ office chairs and $52$ task desks are sold?Select one:a$.$ $$20,500$b$.$ $$23,060$c$.$ $$21,500$d$.$ $$24,620$