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Activity-based costing allocates indirect costs to products based on their use of activities like setups and machine hours. This provides a more accurate product cost than traditional costing.

Indirect manufacturing costs are first allocated to activity cost pools like setups and machine hours. Then the costs in each pool are assigned to products based on their consumption of the activities, like number of setups and machine hours used.

Activity rates are calculated by taking the total cost in each activity cost pool and dividing it by the total activity units like number of setups or machine hours.

ACTIVITY-BASED COSTING EXAMPLE/PROBLEM:

Longview Corp. is considering the use of activity-based costing. The following


information is provided for the production of two product lines:

Activity Cost Cost Driver

Setup $107,000 Number of setups


Machine maintenance 50000 Number of hours
Total indirect $157,000
manufacturing costs

Product A Product B Total


Direct labor hours 7,000 3,000 10,000
number of setups 30 70 100
Number of machine hours 1200 3,800 5,000

Longview plans to produce 350 units of Product A and 225 units of Product B. Compute
the ABC indirect manufacturing cost per unit for each product.

Solution:
1. Calculate the rate:
Setups:
107,000/100setups = 1,070 per setups
Maintenance:
$50,000/5000 no. of machine hrs. = $10 per MH

2. Allocate costs:
Product A Product B

Setups: 1,070 x 30 = $32,100 $1,070 x 70 = $74,900

Maintenance: $10 x 1,200 = 12,000 $10 x 3,800 = 38,000

$44,100/350 $112, 900/225

= $126 per units = $501.78 units


Monthly, Corp. makes two products: C and D. The following data have been summarized:

Product C Product D
Direct materials cost per unit $900 $2,100
Direct labor cost per unit 400 200
Indirect manufacturing cost per unit ? ?

Activity Allocation rate Allocation Base units


Product C Product D
setups $1,000 37 77
machine manufacturing cost per unit $11 1,350 3,850

The company plans to manufacture 225 units of each product. Calculate the product cost per
unit for Products C and D using activity-based costing.

1. Allocate costs:
Product C Product D

Setup: $1,000 x 37 = $37,000 $1,000 x 77 = $77,000

Maint: $11 x 1,350 = 14, 850 $11 x 3,850 = 42,350

51,850/225 units $119,350/225 units

= $230.44 = $530.44
OBJECTIVES:

1. Perform the first stage allocation of overhead costs to the activity cost pools.
2. Compute activity rates the activity cost pools.
3. Construct a table showing the overhead costs of units and four orders.

Ferris Corporation makes a single product – a fire resistant commercial filing cabinet that it sells
to office furniture distributors. The company has a single ABC system that it uses for internal
decision making.

The company has two overhead departments whose costs are listed below:

Manufacturing overhead $500,000


Selling administrative $300,000
Total overhead costs $800,000

The company’s activity based costing systems has the following activity cost pools and activity
pools and activity measures:

Activity Cost Pool Activity Measures


Assembling units Number of units
Processing orders Number of units
Supporting customers Number of units
other Not applicable

Costs assigned to the “other” activity pool have no activity measure; they consist of the costs of
unused capacity and organization sustaining cost- neither of which is assigned to products,
orders or customers.

Ferris Corporation distributes the costs of manufacturing overhead and of selling and
administrative overhead the activity costs pools based on employee interviews, the results of
which are reported below:

Distribution of Resource Consumption Across Activity Cost Pools


Assembling Processing Supporting Other Total
Units Orders
Manufacturing overhead 50% 35% 5% 10% 100%
Selling and Administrative 10% 45% 25% 20% 100%
overhead
Total activity 1,000 units 250 orders 100 __ __
customers

Required:

1. Perform the first stage allocation of overhead costs to the activity cost pools.

2. Compute activity rates for the activity cost pools.

3. Office Mart is one of the Ferris Corporation's customers. Last year Office Mart ordered
filing cabinets four different times. Office Mart ordered a total of 80 cabinets during the
year. Construct a table showing the overhead costs of these 80 units and four orders.

Solution:

1. The first stage allocation of costs to the activity cost pools appears below:

Activity Cost Pools

Assembling Processing Supporting Other Total


Units Orders Customers

Manufacturing overhead $250,000 $175,000 $25,000 $50,000 $500,000

Selling and Administrative 30000 135000 75000 60000 300000


overhead

Total activity $280,000 $310,000 $100,000 $110,000 $800,000


2. The activity rates for the activity cost pools are:

Activity Cost Total Cost Total Activity Rate


Pools Activity
Assembling units $280,000 1000 units $280 per unit
Processing $310,000 250 units $1240 per
orders order
Supporting $100,000 100 units $1000 per
customers customer

3. The overhead cost for the four orders of a total of 80filing cabinets would be computed
as follows:

Activity Cost Total Cost Total Activity Rate


Pools Activity
Assembling units $280 per 80 units $22,400
unit
Processing $1240 per 4 units $4,960
orders order
Supporting $1000 per Not
customers customer applicable
4. The product and customer margin can be computed as follows:

Filing cabinet product margin:


Sales ($595 per unit * 80 units) $47,600
Cost:
Direct materials ($180 per unit *80 units) $14,400
Direct materials ($50 per unit *80 units) $4,000
Volume related overhead (above) $22,400
Order related overhead (above) $4,960 45,760
$1,840
Customer Profitability Analysis - OfficeMart
Product margin (above) $1,840
Less: customer support overhead (above) $1,000
$840

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