Final answer:
The overhead variance for Warner Company is a $30,000 unfavourable variance, which means the company applied $30,000 more in overhead than the actual overhead costs.
Step-by-step explanation:
The overhead variance is calculated by subtracting the applied overhead from the actual overhead. In the case of Warner Company, the actual overhead for the past year was $470,000, and the total applied overhead was $500,000 (sum of applied overhead in work-in-process inventory, finished goods inventory, and cost of goods sold).
To find the overhead variance, we use the following formula:
Overhead Variance = Actual Overhead - Applied Overhead
Overhead Variance = $470,000 - $500,000
Overhead Variance = -$30,000
This result indicates that there is a $30,000 unfavourable variance, meaning that Warner Company has over-applied its overhead costs by $30,000.