Robinwood Fixtures manufactures two products, K4 and X. 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