Urgent, please help?

Consider a project with a life of 6 years with the following information: initial fixed asset investment = $310,000; straight-line depreciation to zero over the 6-year life; zero salvage value; price = $28; variable costs = $14; fixed costs = $139,500; quantity sold = 87,885 units; tax rate = 23 percent. How sensitive is OCF to changes in quantity sold? [Calculate OCF with data given, and also for an arbitrary quantity, say 1000 units more Sensitivity is (OCF2-OCF1/Q2 Q1) This is OCF per unit change in Q] O O O O O $12.29 $0.09 $7.65 $10.78 $13.91