explain how you got all the numbers to this word problem please show calculations??

You are considering a new product launch. the project will cost $820,000,$ have a $4$ year life, and have no salvage value; depreciation is stright line to zero. sales are projected at $490$ units per year, price per unit will be $18,400,$ variable cost per unit will be $15,100,$ and fixed cost will be $830,000$ per year. the required return on the project is $14$ percent, and relevant tax rate is $25$ percent.

A$.$ the unit sales $,$ varible cost, and fixed cost projections given above are probably accurate to within $10\%.$ what are the upper and lower bounds for these scenarios?

what is the base ca NPV$?$

what are the best case and worst case scenarios?

B$.$ calculate the sensitivity of your bese case NPV to changes in fixed cost.

c$.$ what is the accounting break$-$even level of output for this project?