The amount of increase or decrease in a value is the Percent of Increase or Decrease. 

Example: The computer was regularly priced at $1500. If you order the computer over the internet, you can save money as the price is only $1200. What percent discount are you getting?

The regular price, which we will refer to as the
"old" price is $1500. The sales price, which we can call the "new" price is $1200.

The change in price or discount is $1500-$1200 = $300.

If we divide the discount by the "old" price, we arrive at the percent change…
$300÷$1500 = .2 = 20% decrease

 below cost

Slaphappy's Furniture Store is selling all their chairs at 7% below cost. Mark down the following prices and submit them to the manager, Ms. Wam.

 current price of chair  reduced price
 $46  $
 $78  $

Round all answers to the nearest penny.

In the first example, the "old" was more than the "new" and there was a decrease, so we called the change a discount.

In the next problem, there is an increase in price and we call this a markup in price.

Example: In 1992, the democratic support in a local community was about 47,000. In 1996, the support rose to 56,000. What was the percent increase?

 Old = 47000

New = 56000 

 Change or Markup =

 56000- 47000 = 9000

 Percent increase =

 9000 ÷ 47000 =

.1915 = 19.15%


Using Formulas to Solve Percent Problems


  writer:Kevin Gallagher


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