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| Term | Definition |
|---|---|
| amount of error | the direct difference between an observed value and the true or accepted value |
| commission | a payment, a group of people, or an order to create something |
| discount | a deduction from the usual cost of something, typically given for prompt or advance payment or to a special category of buyers |
| fee | a payment made to a professional person or to a professional or public body in exchange for advice or services |
| gratuity | a tip that is giving to someone |
| interest | payment from a debtor or deposit-taking financial institution to a lender or depositor of an amount above repayment of the principal sum (that is, the amount borrowed), at a particular rate |
| markdown | a reduction in price. |
| markup | the amount added to the cost price of goods to cover overhead and profit. |
| percent error | measures how far an estimated value is from the true value, expressed as a percentage |
| percent of change | a calculation that shows how much a value has increased or decreased, expressed as a percentage of the original value |
| percent of decrease | subtract the new value from the original value to find the difference, then divide that difference by the original value and multiply by 100 |
| percent of increase | subtract the original value from the new value, divide the result by the original value, and then multiply by 100 |
| principal | first in order of importance; main. |
| sales tax | a tax on sales or on the receipts from sales. |
| selling price | the amount a customer pays for a product or service. It is calculated by adding the cost to the profit margin |
| simple interest | a method of calculating interest on the principal amount of a loan or investment, without considering the effects of compounding |
| tip | an extra amount of money given to a service worker, like a waiter or delivery driver, as a gesture of gratitude for their service in addition to the cost of the goods or services |
| wholesale cost | the price a seller charges for goods purchased in bulk by another business, such as a retailer, for resale |