Tax and Discounts
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Tax
An amount of money added on to the original price
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Discount
An amount of money subtracted from the original price
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Sale
When an item is listed to be less then it's original price.
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Commission rate
The rate of the amount of money additionally earned from a job
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Percent change/error/increase/decrease
The percentage of the change from the original amount to current
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Tip
An additional amount of money given out of kindness
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Markup/down
When an item is listed to be more or less then it's original price