An article costs $13.80 (excluding tax it costs $12.00). What percentage is applied?

Question

Could you give me the formula to calculate the percentage applied on an item if you have both the import including and excluding taxes?

Harry Crumb · Accepted Answer

First you calculate how much was added:

13.80 - 12.00 = 1.80

Then you find what percentage of the initial figure that was:

1.80/12.00*100 = 15%

Or if you want it as a single formula it's:
(13.80 - 12.00)/12.00*100

An article costs $13.80 (excluding tax it costs $12.00). What percentage is applied?

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