Problem 16-75 (Algo) Comprehensive Variance Problem (LO 16-5, 6) Robinwood Fixtures manufactures two products, K4 and X7. The company prepares its master budget on the bosis of standard costs. The following data are for September: Required: a. Prepare a variance anays 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 cach variance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option