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	40	units of input at	$	5.00
Beta	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	88,000	units at	$	4.50
Beta	152,000	units at	$	8.00

Required: b. Compute materials mix and yield variances.