Prize Mustard uses a process costing system with two departments: (a) a Mixing Department, and (b) a Bottling Department. During May, Prize generated $120,000 in revenue by producing 40,000 gallons (10,000 cases) of mustard. The company reduces its work in process inventories to zero each month. Manufacturing costs for May are as follows: Mixing Bottling Department Department Direct materials........ $16,000 $6,000 Direct labor... $5,600 $3,900 Manufacturing overhead........ $11,400 $8,100 1 Refer to the above data. The unit cost per gaion of mustard processed by the Mixing Department in May was $_ Refer to the above data. The unit cost per case of mustard incurred by the Bottling Department in May was $ 3 Refer to the above data. The total cost of the 10,000 cases transferred to finished goods in May was $ Refer to the above data. Assume that 9,500 cases of mustard were sold in May. The amount charged to cost of goods sold in May $