4. The operating revenues of the three largest business segments for Time Warner, Inc., for a recent year follow. Each segment includes a number of businesses, examples of which are indicated in parentheses. Assume that the variable costs as a percent of sales for each segment are as follows: a. Determine the contribution margin (round to whole millions) and contribution margin ratio (round to whole percentages) for each segment from the information given. b. Does the segment with the highest contribution margin in (a) mean that it is the most profitable segment with the highest operating income