Please help me with this problem and show your work on excel. Econ Stats Question $2$

Dr$.$ Nefario is building a new weapon for Gru. The required investment is $\backslash (\backslash$$ $15,000\backslash ),$ and the annual operating and maintenance costs and salvage values are given in the table below for each year of the weapon's service.

$-$ The entire cost of $\backslash (\backslash$$ $15,000\backslash )$ can be depreciated for tax purposes according to a five$-$year MACRS property class.

$-$ The marginal tax rate is $\backslash (40\backslash \%\backslash ).$

$-$ The after$-$tax MARR is $\backslash (12\backslash \%\backslash ).$

What is the economic service life of this weapon? $($Hint: Your answer should look similar to Table $14\mathrm{.}8$ in your textbook$)$

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