At the beginning of the year, Potter Company estimated the following:

Overhead..........................$864,000

Direct labour hours................320,000

Potter uses normal costing and applies overhead on the basis of direct labour hours. For the month of January, direct labour hours were 7,950. By the end of the year, Potter showed the following actual amounts:

Overhead..........................$904,000

Direct labour hours................330,400

Assume that unadjusted Cost of Goods Sold for Potter was $942,680.

Required:

1. Calculate the predetermined overhead rate for Potter.

2. Calculate the overhead applied to production in January.

3. Calculate the total applied overhead for the year. Was overhead over- or underapplied? By how much?

4. Calculate adjusted Cost of Goods Sold after adjusting the overhead variance.