The sales of a company, in millions of rupees, are given below:

Using the principle of least squares, fit a straight line trend equation to the above data. Show that the sum of deviations is equal to zero. Also determine the sum of squares of deviations. Forecast the sales for the years 2009 and 2010. Show the data and the trend line graphically.

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Year: Sale: 2001 2002 2003 2004 2005 2006 2007 2008 82 80 90 92 83 94 99 92