(I saw this question was already posted here, but unfortunately I can't understand clearly the process on Excel) I HOPE YOU CAN HELP ME STEP BY STEP

Youve spent $10,000 searching for an investment property. Now, youre considering investing in a cottage near Brighton Beach. You can buy the house for $300,000 with cash, earn $12,000 per year in rent and pay $8,000 per year in HOA, taxes and other expenses. Assume youll be able to sell the house in ten years for $400,000. Calculate in Excel the NPV (assume a reasonable discount rate) and IRR of this investment.

Now, assume that you must spend $100,000 in year 10 to raise the house on stilts due to sea level rise from a warming planet. What are the NPV and IRR in this scenario?

Is the cottage still a good investment? Why?