Stacy, Inc., produces a product using a process that allows for substitution between two materials, Alpha and Beta. The company has the following direct materials data for its product. The company had the following results in June. Required: a. Compute materials price and efficiency variances. b. Compute materials mix and yield variances. Complete this question by entering your answers in the tabs below. Compute materials mix and yield variances. (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.)