## Key Concepts

• Sales Tax The sales tax is a percent of the purchase price.
• $\text{sales tax}=\text{tax rate}\cdot \text{purchase price}$
• $\text{total cost}=\text{purchase price}+\text{sales tax}$
• Commission A commission is a percentage of total sales as determined by the rate of commission.
• $\text{commission}=\text{rate of commission}\cdot \text{original price}$
• Discount An amount of discount is a percent off the original price, determined by the discount rate.
• $\text{amount of discount}=\text{discount rate}\cdot \text{original price}$
• $\text{sale price}=\text{original price}-\text{discount}$
• Mark-up The mark-up is the amount added to the wholesale price, determined by the mark-up rate.
• $\text{amount of mark-up}=\text{mark-up rate wholesale price}$
• $\text{list price}=\text{wholesale price}+\text{mark up}$

## Glossary

commission
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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