Thornton Publications established the following standard price and costs for a hardcover picture book that the company produces. Thornton planned to make and sell 29,000 copies of the book. Required: a. - d. Prepare the pro forma income statement that would appear in the master budget and also flexible budget income statements, assuming production volumes of 28,000 and 30,000 units. Determine the sales and variable cost volume variances, assuming volume is actually 30,000 units. Indicate whether the variances are favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).) Required: a. - d. Prepare the pro forma income statement that would appear in the master budget and also flexible budget income statements, assuming production volumes of 28,000 and 30,000 units. Determine the sales and variable cost volume variances, assuming volume is actually 30,000 units. Indicate whether the variances are favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).)