1. Math on the Mind Which is the better deal: ▫20% off a $240 video game system ▫15% off a $210 video game system

2. Percent of Change Unit 4, Lesson 12 Mrs. King Picture from hoffnermath.wordpress.com

3. Percents Refresher: drugstoredivas.net

4. Vocabulary Wholesale Price = the price that stores pay for merchandise Retail Price = the price at which stores sell merchandise Mark up = an increase in price Discount = a reduction in price

5. Formula for percent change: Difference between the “new” and the “original”

6. Find each percent of change. Describe the percent of change as an increase or decrease. 1. $6 to $92. 15 cm to 12 cm x = 50% increase 20% decrease Examples: 3 6x=300 x 6 3 15x=300 x 15

7. Example #1 An auto mechanic purchases a set of tires at a price of $250 an sells them for $310. What is the percent markup in price? x 250 310-25060 250x=6000 x=24

8. Example #2 A sweater is on sale for 20% off the retail price. If the sweater is priced at $70, what is the sale price? 20 70 x 100x=1400 x=14 70 -14 56

9. Example #3 A toy store buys toys at whole sale and issues a markup of 15%. If the store buys a train set for $50, at what price will the store sell the train? 15 50 x 100x=750 x=7.50 50 + 7.50 57.50

10. The price of a skirt decreased from $32.95 to $28.95. Find the percent of decrease. 32.95 – 28.95 32.95 = x 12% 4 32.95 = Example: x 100 x 100 32.95x = 400 32.95

11. Between 1940 and 1980, the federal budget increased from $9.5 billion to $725.3 billion. What was the percent of increase in the federal budget? = 725.3 – 9.5 9.5 = 715.8 9.5 = 7535% Example: x 100 x 100 9.5x = 71580 9.5

13. The Booster Club allows a maximum 70% markup for fundraising. If the donuts cost us $.89 apiece, what is the highest price we could charge for the donuts?

14. Let’s sell the donuts for $1.50 each—it’s easier to make change that way!

15. The day is coming to an end and we still have some donuts left. We decide to post a sign: What is the new price?

17. What is the percent increase from the original purchase price to the new selling price?