Do now Warm-up: Add these words to your vocabulary section of your notebook 18. Percent change: The ratio of the amount of change to the original.

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Do now Warm-up: Add these words to your vocabulary section of your notebook 18. Percent change: The ratio of the amount of change to the original amount represented as a percent 19. Percent increase: The % change found when the original amount increases 20. Percent decrease: The % change found when the original amount decreases

Homework questions? Answers: 1. 30% 2. 120% 3. 28 4. 48 5. $180 6. 100 1. 30% 2. 120% 3. 28 4. 48 5. $180 6. 100 7. $75 8. Ex. 12 is what percent of 10?

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2-10 Change expressed as a percent

Table of contents 1 Page # topic date ? 2-1 Solving One-Step Equations 2/11/15 ? 2-2 Solving Two-Step Equations 2/12/15 ? 2-3 Solving Multi-Step Equations 2/17/15 ? 2-4 Solving Equations with 2/18/15 Variables on Both Sides ? 2-5 Literal Equations and Formulas 2/19/15 ? 2-6 Ratios, Rates & Conversions ? 2-7 Solving Proportions ? 2-8 Proportions & Similar Figures ? 2-9 Percents ? 2-10 Change Expressed as a Percent 1

In the first example, did the sweater have a percent increase or decrease? Percent change Percent change expresses an amount of change as a percent of the original. Percent increase is when the new amount is greater than the original amount Percent decrease is the new amount is less than the original amount

Percent change formulas

Finding a percent decrease A coat is on sale. The original price of the coat is $82. The sale price is $74.50. What is the discount expressed as a percent change?

You try – find the percent decrease The average monthly precipitation for Chicago, Illinois, peaks in June at 4.1 inches. The average monthly precipitation in December is 2.8 inches. What is the percent decrease from June to December?

Finding a percent increase A store buys an electric guitar for $295. The store then marks up the price of the guitar to $340. What is the markup expressed as a percent change?

You try – find the percent increase In one year, the toll for passenger cars to use a tunnel rose from $3 to $3.50. What was the percent increase?

Finding percent error A decorator estimates that a rectangular rug is 5 ft by 8 ft. The rug is actually 4 ft by 8 ft. What is the percent error in the estimated error?

You try – find the percent error You think that the distance between your house and a friend’s house is 5.5 miles. The actual distance is 4.75 miles. What is the percent error in your estimation?