Using this solve for the following: b$.$

Calculate the sensitivity of your base$-$case NPV to changes in fixed costs. $($A negative amount should be indicated by a minus sign. Do not round intermediate calculations and round your answer to $3$ decimal places, e$.$g$.,32\mathrm{.}161.)$

c$.$

What is the accounting break$-$even level of output for this project? $($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$