Cleaning Products manufactures a product using a process that allows for substitution between two materials, X-1 and Y-7. The company has the following direct materials data for its product:

Standard costs for one unit of output
X-1	68 units of input at $1.00
Y-7	12 units of input at $4.60

The following results were reported for January:

Units of output produced	18,000 units
Materials purchased
X-1	1,200,000 units at $1.02
Y-7	220,000 units at $4.55

has a policy of holding no inventories of any kind.

Required: b. Compute materials mix and yield variances.