Really short question! Please help me to solve, thank you!

5. The following estimates have been made for an investment project: Initial investment: $450,000 Unit price: $40 Product life: 5 years Sales volumes (in units): ye Unit cost of a commodity: $20 Cost ofcapital: 790 year 2 year 3 year 4 year 5 3000 6000 7000 8000 7000 Calculate the sensitivity (i.e. maximum tolerable unfavorable change as a percentage of the original estimated value) in (a) sales price, (b) unit costs (c) sales volume, (d) initial investment