The following line graph shows the yearly sales figures for a manufacturing company.(a)  What were the sales in (i) 2002 (ii) 2006?(b)  What were the sales in (i) 2003 (ii) 2005?(c)  Compute the difference between the sales in 2002 and 2006.(d)  In which year was there the greatest difference between the sales as compared to its previous year?