The predetermined overhead rate was 160%.
The preset overhead rate was 160% since $120,000 of studio overhead was applied to Work in Process based on $75,000 of direct employee costs:
We can calculate the predetermined overhead rate using the direct labor costs (which is the allocation base) and the overhead allocated in January:
Applying studio overhead and direct employee costs results in a rate of $120,000/$75000, or 160%.
The amount of the overall manufacturing overhead cost that will be allocated to each unit of product created is calculated using a predefined overhead rate, sometimes referred to as a plant-wide overhead rate. The rate is calculated by dividing the projected number of direct work hours by the fixed overhead cost.
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