construction management please hurry

Q2. For the specific project, you purchase the machine outright for $45,000, pay a maintenance contract of $1,000 per three years, in third and fourth years you will pay 500$ as annual payment (Hint: just for third and fourth years) and expect to be able to resell the machine after 15 years at a salvage value of $5,000. Also, this project receives $6,000 in the fifth year of the project as a profit. Assume that you will be able to take $8,000 as income per year. The interest rate of 4% was for this project. The project age i 15 years. Calculate the net profit from this project