Please provide hand written solution and not excel solution

04 4C. The sale of a product is compared with 3 economic indices for the purpose of possible correlation. Year Sales ('000) Index I Index II Index III 2003 12 100 100 100 2004 15 95 120 110 2005 17 90 140 120 2006 18 88 150 130 2007 16 84 130 140 Make a choice of the proper correlation index for forecasting the sales of the product, using the economic index chosen give the forecast for 2008 if the expected values of the indices in 2008 are as follows: Index 1: 80, Index II: 160 Index III: 150