Problem 15-21A (Algo) Determining and interpreting flexible budget variances LO 155 Zachary Publications established the following standard price and costs for a hardcover picture book that the company produces Assume that Zachary actually produced and sold 25,000 books. The actual sales price and costs incurred follow: Required a. \& b. Determine the flexible budget variances and aiso indicate whether each variance is favorable (F) or unfavorable (U). (Select "None" if there is no effect (l.e., zero variance).) Required a. \& b. Determine the flexible budget variances and also Indicate whether each variance is favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).)