The operating rovenues 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 and contribution margin ratio for each segment from the information given. When required, round to the nearest whole millionth (for example, round 5,688.7 to 5,689 ). Round contribution margin ratio to whole percents for each segment from the information given