Falcon Co$.$ ?produces a single product. Its normal selling price is $$25$ ?per unit. The variable costs are $$16$ ?per unit. Fixed costs are $$21,300$ ?for a normal production run of $5,000$ ?units per month. Falcon received a request for a special order that would not interfere with normal sales. The order was for $1,480$ ?units with a special price of $$19$ ?per unit. Falcon has the capacity to handle the special order, and for this order, a variable selling cost of $$2$ ?per unit would be eliminated. If the order is accepted, the differential effect on profit would be a$(n)$

a$.$ ?increase of $$5,920$

b$.$ ?decrease of $$4,440$

c$.$ ?increase of $$7,400$

d$.$ ?increase of $$9,620$