Falcon Co$.$ produces a single product. Its normal selling price is $$27$ per unit. The variable costs are $$18$ per unit. Fixed costs are $$18,200$ for a normal production run of $5,000$ units per month. Falcon received a request for a special order that would not interfere with normal sales. The order was for $1,700$ units with a special price of $$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 $$5,100$

b$.$ increase of $$4,080$

c$.$ increase of $$6,630$

d$.$ decrease of $$3,060$