Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Percentage

Working with percentages - parts of a whole

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Percentage can be calculated as

p = 100% P / W                             (1) 

where 

p = percentage (%)

P = part

W = whole

Example - Contractors Materials

A contractor spent an amount of 100000 for materials in a custom home project. The total cost of the project was 200000. The materials percentage cost can be calculated as

p = 100% (100000) / (200000)

  = 50%

Example - Weight of Engine

Weight of an engine is 200 kg. The total weight of the car is 1500 kg. The percentage weight of the engine can be calculated as

p = 100% (200 kg) / (1500 kg)

  = 13.3%

Example - Increasing Price

The cost of a contract increase from 100000 to 120000. The percentage increase of the contract price can be calculated as

p = 100% (120000 - 100000) / (100000)

  = 20%

Example - Decreasing Price

The cost of a contract decrease from 100000 to 80000. The percentage decrease of the contract price can be calculated as

p = 100% (100000 - 80000) / (100000)

  = 20%

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