Concept explainers
Handbrain Inc. is considering a change to activity-based product costing. The company produces two products, cell phones and tablet PCs, in a single production department. The production department is estimated to require 2,000 direct labor hours. The total indirect labor is budgeted to be $200,000.
Time records from indirect labor employees revealed that they spent 30% of their time setting up production runs and 70% of their time supporting actual production.
The following information about cell phones and tablet PCs was determined from the corporate records:
- a. Determine the indirect labor cost per unit allocated to cell phones and tablet PCs under a single plantwide factory
overhead rate system using the direct labor hours as the allocation base. - b. Determine the budgeted activity costs and activity rates for the indirect labor under activity-based costing. Assume two activities—one for setup and the other for production support.
- c. Determine the activity cost per unit for indirect labor allocated to each product under activity-based costing.
- d. Why are the per-unit allocated costs in (a) different from the per-unit activity cost assigned to the products in (c)?
a.

Compute the indirect labor cost per unit allocated to cell phones and tablet under a single plant wide factory overhead rate system.
Explanation of Solution
Single plant-wide factory overhead rate: The rate at which the factory or manufacturing overheads are allocated to products is referred to as single plant-wide factory overhead rate.
Formula to compute single plant-wide overhead rate:
Activity-based costing (ABC) method: The costing method which allocates overheads to the products based on factory overhead rate for each activity or cost object, according to the cost pooled for the cost drivers (allocation base).
Formula to compute activity-based overhead rate:
Compute the indirect labor cost per unit allocated to cell phones and tablet under a single plant wide factory overhead rate system.
Types of Products |
Indirect labor cost (A) (2) |
Number of units (B) |
Indirect labor cost per unit |
Cell phones | $100,000 | 80,000 | $1.25 |
Tablets | $100,000 | 80,000 | $1.25 |
Table (1)
Working note (1):
Compute the single plant-wide overhead rate using direct labor hour (DLH) as the allocation base.
Working note (2):
Compute the total indirect labor cost for each product.
Types of Products | Indirect labor hours | × | Single Plant-Wide Overhead Rate (1) | = | indirect labor cost |
Cell phones | 1,000 | × | $100 per DLH | = | $100,000 |
Tablets | 1,000 | × | $100 per DLH | = | $100,000 |
Table (2)
b.

Compute the activity-based overhead rate for each of the given activities.
Explanation of Solution
Compute the activity-based overhead rates for each activity.
Computation of Activity-Based Overhead Rates | |||
Activity |
Activity Cost (C) |
Total Activity-Base Usage (D) |
Activity-Based Overhead Rates |
Setup | $60,000 (3) | 4,000 setups | $15 per setup |
Production support |
140,000 (4) | 2,000 DLH | $70 per DLH |
Table (3)
Working note (3):
Compute the activity cost for setup activity.
Working note (3):
Compute the activity cost for production support activity.
c.

Compute the activity-cost per unit of the each product.
Explanation of Solution
Compute the activity cost allocated per unit of cell phone.
Activity | Activity-Based Overhead Rates | × | Actual Use of Activity-Base (Cost Driver) | = | Activity Cost Allocated |
Setup | $15 per setup | × | 1,200 setups | = | $18,000 |
Production support | $70 per DLH | × | 1,000 DLH | = | 70,000 |
Total activity costs allocated to cell phones (E) | $88,000 | ||||
Number of units of cell phone (F) | 80,000 units | ||||
Activity-based overhead cost per unit of cell phone | $1.10 |
Table (4)
Note: Refer to Table (2) for the value and computation of activity allocation rates.
Compute the activity cost allocated per unit of tablet.
Activity | Activity-Based Overhead Rates | × | Actual Use of Activity-Base (Cost Driver) | = | Activity Cost Allocated |
Setup | $15 per setup | × | 2,800 setups | = | $42,000 |
Production support | $70 per DLH | × | 1,000 DLH | = | 70,000 |
Total activity costs allocated to tablets (G) | $112,00 | ||||
Number of units of tablet (H) | 80,000 units | ||||
Activity-based overhead cost per unit of tablet | $1.40 |
Table (5)
Note: Refer to Table (2) for the value and computation of activity allocation rates.
d.

Discuss the reason why the per unit allocated costs in single plant-wide overhead rate approach is different from the per unit allocated costs in the activity based costing.
Explanation of Solution
The product cost under single plant-wide overhead rate approach and ABC approach are different. The product cost is distorted in single plant-wide overhead rate approach because the time spent for setup production for cell phones and tablets is not in the same ratio as the direct labor hours used in support production for cell phones and tablets.
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