N2

Percentages


A percentage is a fraction of 100.
Percentages are used in the modern world in everyday shopping to inflate or deflate prices.
The VAT is a percentage tax on a product.

To work out the original price, new price or percentage increase or decrease there is a genral formula.

New price as a result of increase:
Price x (1+increase(%))

Example:
£100 x (1 + 0.2) = £120

New price as a result of decrease:
Price x (1 - decrease(%))

Example:
£100 x (1 - 0.3) = £70

Original price before increase:
Price with increase ÷ 1 + increase(%)

Example:
£117.50 ÷ 1+ 0.175 = £100

Original price before decrease:
Price with decrease ÷ 1 - decrease(%)

Example:
£80 ÷ 1 - 0.2 = £100

By Muhammed