According to the following data for sales:

Year 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Sales 80 86 90 95 100 180 185 190 200 220 300 290 Revenue 356 398 372 360 365 350 ($, 000) Price ($) 1 1.5 1.5 1.9 2 2.5 2.5 2.8 3 3.5 4 3.6 4.5 4.0 4.2 4.5 4.3 4.8