I need the Excel formula for these questions

5 Your Uncle IRV dies and leaves you an annuity of $50,000/yr for 20 years. What is the PV of the annuity? Discount Rate is 12% Discount Rate is 0% What is the NPV? What is the NPV? 6 Sample Cash Flow 1 Cash Flow Year 1 $ (5,000,000) Year 2 $ 50,000 Year 3 $ 100,000 Year 4 $ 150,000 Year 5 $ 175,000 Year 6 $ 200,000 Year 7 $ 225,000 Year 8 $ 250,000 Year 9 $ 275,000 Year 10 $ 8,000,000 Discount Rate 7.00% For the above cash flow and DR answer the following: What is the NPV? What is the IRR? 7 If the discount rate for the above cash flow is changed to 12%. What is the NPV and IRR? What is the NPV? What is the IRR