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7.5 percent of increase
 

7.5 percent of increase

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    7.5 percent of increase 7.5 percent of increase Presentation Transcript

    • Lesson 7.5 , For use with pages 366-369 Use a percent proportion. 1. 48 is what percent of 320 ? 2. What number is 30% of 80 ?
    • Lesson 7.5 , For use with pages 366-369 Use a percent proportion. 1. 48 is what percent of 320 ? 2. What number is 30% of 80 ? ANSWER 15% ANSWER 24
    • Percent of Increase 7.5 Applications of Percents Real Life Situations
      • Is a discount of 30% off the original price, followed by a discount of 50% off the sale price, the same as a discount of 80% from the original price?
    • Essential Questions
      • What are different situations percents are used in real life?
      • As a consumer, why is it important for you to know about percents?
      • How important is it to be able to understand the relationship between fractions and percents? Why?
    • Percent of Increase
      • A “markup” from wholesale to resale or “retail” pricing.
        • Wholesale: The price a company pays for items.
        • Retail: the price you pay for items.
      • A percent representing an increase in something
    • Percent of Increase
      • Most of the time our setup will be:
    • Percent of Increase
      • Old: $250
      • New: $300
      • What is the “amount of increase”?
      • What is the “original” amount (before the change)?
      • Set up: x will equal the Percent of Increase
      x = 20% 250x 50( 100) = 250x 5,000 = 250 250
    • Percent of Increase
      • The cost of a bus ride increased from $20 to $26. What is the percent of increase?
      x = 30% 6 20 = x 100 20x 6( 100) = 20x 600 = 20 20
    • Percent of Increase
      • The bike shop purchased mountain bikes at the wholesale price of $434.69 each and sold them at the retail price of $630.30. What was the percent of increase?
      • Round to the nearest whole percent.
      x = 45% 195.61 434.69 = x 100 434.69x 195.61( 100) = 434.69x 19,561 = 434.69 434.69
    • Percent of Increase
      • Lincoln Middle School’s enrollment increased 75 students over last year’s enrollment. This was a 15% increase. What was last year’s enrollment?
      x = 500 students 75 x = 15 100 15x 75( 100) = 15x 7,500 = 15 15
    • Percent of Increase
      • Because of a new subdivision, the enrollment at Marion’s Elementary increased to 385 students, about a 20% increase. What was last year’s enrollment?
      x = 320.8 students 385 x = 120 100 120x 385( 100) = 120x 38,500 = 120 120
    • Percent of Increase
      • #10 from the worksheet:
      • Find the total cost of a $22 toaster whose price is increased 18%.
      x = $3.96 x = $25.96 $3.96 + 22 = $25.95 x 22 = 18 100 100x 18( 22) = 100x 396 = 100 100 x 22 = 118 100 100x 22( 118) = 100x 2,596 = 100 100
      • Assignment:
      • Percent of Increase Worksheet #1-10
        • Numbers 12-16 can be done for extra credit
        • Your assignment will be graded as follows:
          • 1 point for your proportion
          • 1 point for your answer