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INSTRUCTORS Carleen Eaton Grant Fraser Eric Smith

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For more information, please see full course syllabus of Algebra 1
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Lecture Comments (6)

1 answer

Last reply by: jeffrey breci
Sun Jan 8, 2012 9:25 PM

Post by Daniel Delapena on December 11, 2011

I believe Jeff is correct...and also, example 4 seems like it would be 25% of change, due to the 25% discount from the original price? The answer was in the question?

2 answers

Last reply by: Stacy Amadio
Thu Sep 15, 2011 10:22 PM

Post by Jeff Mitchell on January 23, 2011

Wow, I disagree with example one completely. if it changed from 50 to 70 it did not increase 140%. if it increased 100% it would have gone from 50 to 100. Since it did not go past 100 it is clearly less than 100% increase.
I think the real equation should be (70-50) / 50 or 20/50 which is 40/100 =.4 or 40%

0 answers

Post by SASHKA YAKIMOVA on January 1, 2010

In Example 4, shouldn't the percent of change be calculated by dividing the NEW VALUE by the ORIGINAL VALUE?

139.78 : 175 = 0.7987 (78.97% or ~80%)

Applications of Percents

  • A percent of change is an increase or decrease expressed as a percent. If the new value is greater than the original one, it is a percent of increase; otherwise, it is a percent of decrease.

  • Sales tax is a familiar example of a percent of increase.

  • Discount is an example of a percent of decrease.

  • When solving these kinds of problems, always write the percent as either a fraction with a denominator of 100 or a decimal equivalent to the percent.

Applications of Percents

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Definitions 0:22
    • Percent of Change
    • Percent of Increase
    • Percent of Decrease
  • Examples of Percent of Change 1:14
    • Sales Tax
    • Discount
  • Lecture Example 1 2:51
  • Lecture Example 2 4:46
  • Additional Example 3
  • Additional Example 4