Discount
A discount is an amount by which the regular price of an item has been reduced. Discounts can be expressed as dollar amounts, common fractions, or percents.
Examples 
Given a bicycle that initially costs $100 that is discounted 25%, the discount on the bicycle, expressed as a dollar amount, is $25. Subtracting the $25 from the original price of $100 will yield the discounted price of $75: 
1. 25% = = 0.25 
2. 0.25 × $100 = $25 
3. $100  $25 = $75 

In the above case case, an understanding of percentages makes it easy to translate the percentage value to a dollar amount. Since percentages are ratios expressed as a fraction of 100, the discounted percentage is equal to the discounted dollar amount. If the value that needs to be discounted is not $100, the percentage discount can be converted to its decimal form and multiplied by the value to be discounted in order to determine the discounted price. 

For example, given a 15% discount on an item that costs $123: 
1. 15% = = 0.15 
2. 0.15 × $123 = $18.45 
3. $123  $18.45 = $104.55 
