Percent Increase & Decrease

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Presentation transcript:

Percent Increase & Decrease When an amount changes, we can compare the original amount to the changed amount using a percent.

Lesson: Percent Increase & Decrease Formula: Changes the amount you get into a percent. Percent Increase or Decrease Then it is a Percent Increase. Then it is a Percent Decrease.

The laptop has had a 75% decrease in price. Example. Find the percent of change and state whether it is an increase or a decrease. A computer company sold a laptop for $1,200 in 1997. Now, the same laptop could be bought for $300. 300 1200 1200 Then it is a Percent Decrease. The laptop has had a 75% decrease in price.

Finding the old/new amounts. Sometimes rather than finding the percent of change, we will have to find one of the missing amounts GIVEN the percent of change.

The salesman made 210 sales this month. Example. A salesman increased his 150 sales from last month by 40%. How many sales did he make this month? 150 40% 150 The salesman made 210 sales this month.

Check Points When Jim was exercising, his heart rate went from 70 beats per minute to 98 beats per minute. What was the percent increase?

Check Points In 1999, a certain stock was worth $1.25 a share. In 2002, the same stock was worth $0.85 a share. What was the percent decrease?

Check Points Sarah bought a DVD player originally priced at $450 that was on sale for 20% off. What was the sale price? (Hint: How much was the discount?)

Check Points Mr. Olsen has a computer business in which he sells everything at 40% above the wholesale price. If he purchased a printer for $85 wholesale, what will be the retail price?

Homework p. 418 #17-29 odd