Activity-based product costing activity-based costing study. The controller identified the amount of factory overhead required by the critical activities of the organization as follows: The activity bases identified for each activity are as follows: Each product requires 40 minutes per unit of machine time. Required: If required, round all per unit amounts to the nearest cent. 1. Determine the activity rate for each activity. 2. Determine the total and per-unit activity cost for all three products. 3. Why aren't the activity unit costs equal across all three products since they require the same machine time per unit? The unit costs are different because the products consume many activities in ratios different from the