What is the formula for pv/pvaf like it would be =

I just need the formula for that one!

4-12 12,000.00 $ 4,000.00 $ 7,000.00 $ 10,000.00 $ $ 45.00 $ 45.00 $ 45.00 $ 45.00 $ 25.00 $ 25.00 $ 25.00 $ 25.00 Year Sales units (A) Selling price/unit Less: Variable cost/unit Contribution (45-25) B Total Contributions A XB Less Advertising Expenses 20.00 $ 20.00 $ 20.00 $ 20.00 $ 80,000.00 $ 140,000.00 $ 200,000.00 $ 240,000.00 $ $ 70,000.00 $ 10,000.00 $ 70,000.00 $ 70,000.00 $ 50,000.00 $ 40,000.00 150,000.00 $ 200,000.00 Less Fixed Costs Net Cash Flow PV/PVAF Present value of cash flows $ 120,000.00 $ $ (110,000.00) $ $ 0.83 $ 120,000.00 $ (50,000.00 $ 0.69 $ 120,000.00 $ 120,000.00 30,000.00 $ 80,000.00 0.58 $ 2.33 $ (91,630.00) $ (34,700.00) $ 17,370.00 $ 186,720.00