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8.4 Percent of Increase and Decrease

8.4 Percent of Increase and Decrease. The Difference Original Amount. Percent Change =. Percent change is the ratio of the amount of change to the original amount. x 100. Percent increase describes how much the original amount increases.

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8.4 Percent of Increase and Decrease

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  1. 8.4 Percent of Increase and Decrease

  2. The Difference Original Amount Percent Change = Percent change is the ratio of the amount of change to the original amount. x 100 Percent increase describes how much the original amount increases. Percent decrease describes how much the original amount decreases.

  3. Percent of Change Remember a ratio can be written as a fraction! amount of change x 100 = % of original amount change

  4. Problem # 1 Zack Cole shot an 86 on the golf course on Monday. On Friday he shot a 95. What is the % of change? Is the score increasing or decreasing?

  5. Answer #1 amount of change x 100 original amount 95-86 = 9 = 0.10465(100) = 86 86 10.5% Increase Because score was going up!

  6. Problem # 2 Kelly Dyer became a great writer. She had a picnic each year to celebrate the date of her first published work. The 1st year 50 people came. The 2nd year 30 people came. What is the percent of change?

  7. Answer #2 50-30 = 20 = 0.4(100) 50 50 40% Decrease Because the amount of people decreased from year 1 to year 2!

  8. Problem # 3 Last six weeks Joseph Lawhorn made an 88 average in class. This six weeks he made a 92. Please figure the percent of change.

  9. Answer #3 92-88 = 4 = 0.04545(100) 88 88 4.5% Increase Because his average is going up!

  10. Problem # 4 Angela Smyre became a famous architect. She made $90,000 in 2004. In 2005 she made $120,000. What is the percent of increase?

  11. Answer #4 120,000- 90,000 = 30,000= .33(100) 90,000 90,000 33.3% Increase

  12. Problem # 5 Amber Robinson became a foster mother, because she is so good with children. She took care of 8 children in 2003. In 2004 she had only 5. What is the percent of change?

  13. Answer #5 8 - 5 = 3 = 0.375(100) 8 8 37.5% Decrease

  14. Problem # 6 Jonathan Rogers drew 47 planes in 4th period. He drew 28 in 5th period. What is the percent of change?

  15. Answer #6 40.4% Decrease

  16. Problem # 7 Matt Viers bought 42 CD’s last year. He bought only 35 this year. (He lost all his money in the stock market) What is the percent of change?

  17. Answer #7 16.7% Decrease

  18. Problem # 8 Lisa LaViers became a great singer. She was so famous she had 12 body guards at one concert. At the next concert she had 15 body guards. What is the percent of change?

  19. Answer #8 25% Increase

  20. Problem # 9 Jessica Summey and Emily Lower were famous mud wrestlers. They made $45,000 in 2008. In 2009 they made $60,000. What is the percent of change?

  21. Answer #9 33.3% Increase

  22. Problem # 10 Brittany Berrier became a famous doctor. She took out 15 gall bladders on May 15th. She took out 30 on May 18th. What is the % of change?

  23. Answer #10 100% Increase

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