Working with Percentages

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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 $100000 for materials in a custom home project. The total cost of the project was $200000 and the materials percentage cost can be calculated as

p = 100% ($100000) / ($200000)

  = 50%

Example - Engine Weight

An engine weight 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 - Price Increase

A contractors cost increase from $100000 to $120000. The percentage cost increase can be calculated as

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

  = 20%

Example - Price Decrease

A contractors cost decrease from $100000 to $80000. The percentage price decrease can be calculated as

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

  = 20%

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Related Topics

• Economics - Engineering economic concepts - cash flow diagrams, discount rate, internal rate of return - IRR, income taxes, inflation

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