res. 9. Assume that all variances are Required: a. Prepare a cost variance analysis for each variable cost for the River Plant. b. Prepare a fixed overhead cost variance analysis. c. (Appendix) Prepare the journal entries to record the activity for the last period using standard costing. Assume that all variane closed to Cost of Goods Sold at the end of the operating period. Complete this question by entering your answers in the tabs below. Prepare a cost variance analysis for each variable cost for the River Plant. Note: 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