Chair Company manufactures two modular types of chairs: one for the residential market, and the other for the office market. Budgeted and actual operating data for the year 2013 are: REQUIRED: (Show your detailed calculations.) Compute the following variances in terms of contribution margin: a. Compute the total static-budget variance, the total flexible-budget variance, and the total sales-volume variance. b. Compute the sale-mix variance and the sales-quantity variance by type of chair, and in total