Sun Brite has a new pair of sunglasses it is evaluating. The company expects to sell $6,400$ pairs of sunglasses at a price of $$159$ each and a variable cost of $$111$ each. The equipment necessary for the project will cost $$335,000$ and will be depreciated on a straight$-$line basis over the $7-$year life of the project. Fixed costs are $$250,000$ per year and the tax rate is $25$ percent. How sensitive is the operating cash flow to a $$1$ increase in variable costs per pairs of sunglasses?

Multiple Choice

$$$$5,333$

$$4,320$

$$$$4,320$

$$$$4,800$

$$4,800$