In building an airliner in 2008, the materials cost 45% of the total, wages 42% and other expenses 13%. By 2009 the cost of materials had increased by 8%, wages had gone up by one-seventh, but other expenses were reduced by 10%. Find the percentage increase in the cost of the airliner.

Percentages are numbers or ratios that are expressed as a fraction of 100. Percentages are often represented by the percent sign, %.  Here are some ways to calculate percentages: To find a percentage of a number: Multiply the number by the decimal form of the percentage. For example, to find 30% of 40, multiply (30/100)(40) = 0.3 x 40 = 12. To convert a decimal to a percentage: Multiply the decimal by 100. For example, .87 x 100 = 87%. To calculate a percentage: Use the formula Percentage = (Value/Total Value) x 100. For example, if there are 10 dogs in a group of 40 animals, the... Show more

Percentages are numbers or ratios that are expressed as a fraction of 100.

Percentages are often represented by the percent sign, %. 

Here are some ways to calculate percentages:
To find a percentage of a number: Multiply the number by the decimal form of the percentage. For example, to find 30% of 40, multiply (30/100)(40) = 0.3 x 40 = 12.
To convert a decimal to a percentage: Multiply the decimal by 100. For example, .87 x 100 = 87%.
To calculate a percentage: Use the formula Percentage = (Value/Total Value) x 100.

For example, if there are 10 dogs in a group of 40 animals, the percentage of dogs is: Percentage of dogs = 10/40 x 100 = 25%.
 

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