Problem $3$: In a separate sheet, calculate the Sum and the Net Present Value of this income stream using a discount rate of eight percent. Set the discount rate so that a user can vary the rate to determine the results of different discount rates $($absolute cell reference$).$

$\backslash$table$[[2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021],[$$$500,$$$600,$$$700,$$$800,$$$900,$$$1000,$$$1100,$$$1200,$$$1300,$$$1400,$$$1500$