Solve question 1,2 in two pictures?

Your cousin makes $500 an hour as a lawyer Iuels) and considering paying someone $900 to paint his house. If he decide to do it himself , it will take 6 hours. What is his opportunity cost for doing the paint himself? Calculate the net present worth (at year O) of the following series of incomes and expenses at 4% per quarter? Income Expences Quarters $ s 0 12.000 -1,000 1-6 700 -100 7-11 800 -900