Please show the formula's and the full work not using excel so I can fully understand it.

You are considering a project that costs $500 to invest in today, and will pay you $100 next year, $50 in two years, and $100 in three years. The cash inflow will grow at a constant rate of 3% per year after year 3, and you will receive cash inflows for 25 years (total including the first three CFs). Your discount rate is 14%. What is the NPV of the project? Also, what would the NPV be if the cash inflows continued forever? Show your work