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Math on the Mind

Math on the Mind. Which is the better deal: 20% off a $240 video game system 15% off a $210 video game system. Percent of Change. Unit 4, Day 9 Mrs. King. Picture from hoffnermath.wordpress.com. Percents Refresher:.

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Math on the Mind

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  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, Day 9 Mrs. King Picture from hoffnermath.wordpress.com

  3. Percents Refresher: • http://www.brainpop.com/math/ratioproportionandpercent/percents/preview.weml 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. 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 310-250 60 250 250x=6000 x=24

  7. 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? 70 -14 20 x 70 56 100x=1400 x=14

  8. 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? 50 + 7.50 15 x 50 57.50 100x=750 x=7.50

  9. Save the Elves

  10. 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?

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

  12. 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?

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

  14. Extra Practice • “Quiz”: http://www.thegreatmartinicompany.com/percent-percentage/percent-change.html • Rags to Riches: http://www.quia.com/rr/230204.html

  15. Homework Page 171 #1-14 dreamstime.com

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