Initial outlay at the beginning of year $1=500,000.$ Desired rate of return$=18\%$Cash Flows into the Company:Year $1=100,000$Year $2=500,000$ and outflow $($expenditure$)$ of $200,000$Year $3=200,000$Year $4=300,000$

How do I find the NPV$,$ IRR, and the Payback?

$11$:$09$

Projects Considered

$\backslash$table$[[,$A$,$B$,$C$,$D$],[1,$Period $($Years$),$Cash Flow,Outflow,$],[2,0,($$$500,000),,],[3,1,100,000,,],[4,2,500,000,$$$200,000\mathrm{.}00,],[5,3,200,000,,],[6,4,300,000,,],[7,,,,],[8,,,,],[9,,,,],[10,,,,],[11,,,,],[12,$Interest Rate,$18\%,,],[13,$Net Present Value:NPV$(),$$$557,771\mathrm{.}71,,],[14,$Internal Rate of Return $($IRR$),37\%,,],[15,$Payback,$2\mathrm{.}5,,],[16,,,,],[17,,,,],[18,,,,],[19,,,,],[20,,,,],[21,,,,],[22,,,,],[23,,,,],[24,,,,],[25,,,,],[26,,,,],[27,,,,],[28,,,,],[29,,,,],[30,,,,],[31,,,,],[32,,,,],[33,,,,],[34,,,,],[35,,,,],[36,,,,],[37,,,,],[38,,,,],[39,,,,],[40,,,,],[11,,,,],[f_x,$Enter text or form,ula here,,$]]$

Why am I getting this result? Am I doing this correctly?