If plotted, the following sales series would appear curvilinear. This indicates that sales are increasing at a somewhat constant annual rate (percent). To fit the sales, therefore, a logarithmic equation should be used.

a. Determine the logarithmic equation.
b. Determine the coordinates of the points on the logarithmic straight line for 2005 and 2011.
c. By what percent did sales increase per year, on the average, during the period from 2004 to 2014?
d. Based on the equation, what are the estimated sales for2015?

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16.8250 1997 36.0155 2003 46.62 2009 60.80 1992 20.6125 1998 40.6111 200452.20 2010 65.33 1993 20.3024 1999 35.0230 2005 59.85 2011 66.35 1994 18.3160 2000 49.5625 2006 62.00 2012 68.43