please show the factor or formula way to do this

2.93 Encon Systems, Inc. sales revenues for a product line introduced 7 years ago is shown. Use tabu- lated factors, a calculator or a spreadsheet to cal- culate the equivalent annual worth over the 7 years using an interest rate of 10% per year. Year Year Revenue, $ 0 Revenue, $ 4,000,000 4,000,000 4,000,000 4,000,000 4 5 1 2 5,000,000 5,000,000 5,000,000 5,000,000 6 7 3