Consider a four-year project with the following information: initial fixed asset investment = $$\$ 480,000$$; straight-line depreciation to zero over the four-year life; zero salvage value; price $$=\$ 37 ;$$ variable costs $$=\$ 23 ;$$ fixed costs $$=\$ 195,000 ;$$ quantity sold $=90,000$ units; tax rate $=34$ percent. How sensitive is operating cash flow to changes in quantity sold?