A commission is a percentage of total sales as determined by the rate of commission.

discount

An amount of discount is a percent off the original price, determined by the discount rate.

mark-up

The mark-up is the amount added to the wholesale price, determined by the mark-up rate.

sales tax

The sales tax is a percent of the purchase price.

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Prealgebra. Provided by: OpenStax. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/contents/caa57dab-41c7-455e-bd6f-f443cda5519c@9.757