I'm not understanding how to figure these formulas to get the correct answers on this excel sheet.. Please help!

Adapted by Robert Timmons, D.B.A. 2010 - 2015 Managerial Finance BUS 8003 Chapter 8 8e Selected Problems 2 - 30 Printer Friendly NOTE: The problem numbers on the following worksheets correspond with the same End-of-Chapter problems of Essentials of Corporate Finance, 8th Edition. Adapted and Modified from Essentials of Corporate Finance (Ross, Westerfiled & Jordan) 8th Edition Robert Timmons, D.B.A - Revised July, 2015 Chapter 8 8e Note: Use your text and provided resources! See Problem details beginning page 267 Selected Questions 2 - 30 See Key Equations used beginning page 614 See Excel examples "Supplemental Text Provided Worksheet 8e.xls See selected problem solutions beginning page 617 Note: These problems include some BIG "helps". These will assist you through this worksheet but the primary purpose is to provide you with additional information should you see similar problems included in a test or elsewhere. Question 2 Annual cash inflow # of years Initial cost Initial cost Initial cost $ $ $ $ For helpful information on these Essentials_8e_Chapter_08_Ex 875 8 3,200 4,600 7,900 . Initial cost $3,200 $4,600 $7,900 Payback Incorrect Incorrect (If) Initial cost / Annual cash inflow