Robinwood Fixtures manufactures two products, K4 and X7. The company prepares its master budget on the basis of standard costs. The following data are for September: Required: a. Prepare a variance analysis for each variable cost for each product. b. Prepare a fixed overhead variance analysis for each product. Note: For all requirements, Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, or " U " for unfavorable. If there is no effect, do not select either option