Wool Creations Inc. manufactures wool sweaters. Costs incurred in making 9,900 sweaters in October included $30,195 of fixed manufacturing overhead. The total absorption cost per sweater was $10.80.

Required:

a. Calculate the variable cost per sweater. (Round intermediate calculations and final answer to 2 decimal places.)

b. The ending inventory of sweaters was 1,300 units lower at the end of the month than at the beginning of the month. By how much and in what direction (higher or lower) would cost of goods sold for the month of October be different under variable costing than under absorption costing? (Round intermediate calculations to 2 decimal places.)

c. Express the sweater cost in a cost formula. (Round your intermediate calculations and "Variable cost" to 2 decimal places.)