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

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Presentation transcript:

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, Lesson 12 Mrs. King Picture from hoffnermath.wordpress.com

Percents Refresher: drugstoredivas.net

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

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

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

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 x=6000 x=24

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? x 100x=1400 x=

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? x 100x=750 x=

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

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? = – = = 7535% Example: x 100 x x =

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?

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

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?

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