The management of a company is evaluating the possibility of

replacing their large mainframe computer with a modern network

system that requires much less office space. The network would cost

$$500,000($including installation costs$)$ and would generate $$125,000$

per year in after$-$tax operating cash flow $($including the

depreciation change$)$ over the next five years due to efficiency

gains. The new network will not have any salvage value at the end

of the $5$th year and this project does not require any working

capital changes. The mainframe has a remaining book value of

$$50,000$ and would be immediately donated to a charity for the tax

benefit. The WACC is $10\%$ and its tax rate is $40\%\mathrm{.}14-$What is the cash flow at time $0?$a$)($$$500,000)$b$)($$$450,000)$c$)($$$480,000)$d$)($$$550,000)$e$)($$$476,000)$f$)$ None of the above$15-$What is the NPV$?$a$)$ $$23,848\mathrm{.}23$b$)($$$6,151\mathrm{.}65)$c$)($$$26,151\mathrm{.}65)$d$)($$$2,151\mathrm{.}65)$e$)$ $$10,354\mathrm{.}36$f$)$ None of the above$$I will rate! I need to see the work$/$formulas$.$ Thank you!

Please include fully worked out solutions, including the formulas used to get to the answer.