In a trend analysis, an index number of 139 for 2009 sales indicates that a. sales for 2009 were 139 percent higher than sales for the same company in the base year. b. sales for 2009 for this company were 139 percent of the sales figure of another company being used in the comparison. c. sales for 2009 were 139 percent of the sales for the same company in the base year. d. actual sales for 2009 exceeded budgeted sales for 2009 by 39 percent