ces 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. Standard costs for one unit of output Alpha Beta 40 units of input at $5.00 80 units of input at $7.50 The company had the following results in June. Units of output produced 2,000 units Materials purchased and used Alpha Beta 88,000 units at $4.50 152,000 units at $8.00 Required: a. Compute materials price and efficiency variances. b. Compute materials mix and yield variances