**amount of discount**The amount of discount is the amount resulting when a discount rate is multiplied by the original price of an item.

**discount rate**The discount rate is the percent used to determine the amount of a discount, common in retail settings.

**interest**Interest is the money that a bank pays its customers for keeping their money in the bank.

**list price**The list price is the price a retailer sells an item for.

**mark-up**A mark-up is a percentage of the original cost used to increase the price of an item.

**mixture problems**Mixture problems combine two or more items with different values together.

**original cost**The original cost in a retail setting, is the price that a retailer pays for an item.

**principal**

The principal is the original amount of money invested or borrowed for a period of time at a specific interest rate.

**rate of interest**The rate of interest is a percent of the principal, usually expressed as a percent per year

.**simple interest**Simple interest is the interest earned according to the formula I=Prt.

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