Math in the Workplace - Measurements
MK ENVIRONMENTAL SERVICES
Engineering & Construction
Estimator
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Job Description: Estimate the cost
to build things which determines how much our company will be paid. |
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Problem:
Estimate how much it will cost to build the doghouse shown. The doghouse is
built with plywood fastened together with clips (part of the hardware) on a gravel
pad. 
The table below lists the items to include in your cost estimate with some
facts that will help you estimate the cost. You must estimate the amount of each
item and calculate the cost, then total it all up. Assume the doghouse has a door
as illustrated, and that you can sell back any material you do not use.
• Gravel weighs 120 pounds per cubic foot.
• One quart of paint will cover 100 square feet of plywood.
• Hardware costs 25% of the cost of the other materials.
• It will require two working days (8-hour days) to build.
| Description |
Unit of
Measurement |
Cost/Unit |
Quantity |
COST |
| Plywood siding & roof |
Square foot |
$ 0.50 |
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| Gravel |
Pound |
$ 0.10 |
|
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| Paint (two coats) |
Quart |
$ 15.00 |
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| Subtotal |
|
| Hardware |
% of materials |
25% |
|
|
| Labor |
Hour |
$20.00 |
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| TOTAL |
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MK ENVIRONMENTAL SERVICES
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Solution:
| Plywood: |
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Gravel: |
3' x 2' x 2 sides = 12 ft2
4' x 2' x 2 sides = 16 ft2
3' x 4' x 1 roof = 12 ft2
40 ft2 |
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3' x 4' x 0.5' = 6 ft3
6 ft3 x 120 lb/ft3 = 720 lb |
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| Paint: |
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Labor: |
40 ft2 
100 ft2/qt = .4
.4 x 2 coats = 0.8 qts |
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2 days at 8 hrs/day = 16 hrs |
| Description |
Unit of
Measurement |
Cost/Unit |
Quantity |
COST |
| Plywood siding & roof |
Square foot |
$ 0.50 |
40 sq ft |
$20.00 |
| Gravel |
Pound |
$ 0.10 |
720 lb |
$72.00 |
| Paint (two coats) |
Quart |
$ 15.00 |
.8 qt |
12.00 |
| Subtotal |
$104.00 |
| Hardware |
% of materials |
25% |
|
$26.00 |
| Labor |
Hour |
$20.00 |
16 hrs |
$320.00 |
| TOTAL |
$450.00 |