A firm has two chemicals inputs for its finished goods units: Chemical A and Chemical B. Typically the firm uses 2 gallons of Chemical A for every 3 gallons of Chemical B. Chemical A standard price is $4.00 per gallon Chemical B standard price is $6.00 per gallon Chemical A actual price is 55.00 per gallon Chemical B actual price is $4.50 per galion This period, the firm instead actually used 3.000 gallons of Chemical A and 2.000 gallons of Chemical B (producing 5.000 gallons of finished goods). What is the firm's mix variance for this product this period (round to nearest cent if necessary)? a $2,000 unfavorable O b. $500 favorable O c. $2,000 favorable O d. $500 unfavorable