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## Percent of Change

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**How much did a gallon of milk cost in the 1950’s?**What happens when you keep sharpening your pencil? What if you get a raise in your allowance?**Percent of Change:**• Compares the amount of change to the ORIGINAL amount!**Percent of Increase:**• An increase from the ORIGINAL amount Ex) The cost of milk in the 1950’s compared to today’s cost.**Percent of Decrease:**• A decrease from the ORIGINAL amount Ex) What happens to your pencil when you keep sharpening it?**Amount of Change =**• The difference between the ORIGINAL amount and the NEW amount. Life expectancy in 1900 was 45 years old; Life expectancy in 2012 is 78 years old. What is the amount of change? 78 – 45 = 33**Percent of Change Proportion:**SUBTRACT!!! Amount of Change % --------------------------- = ------------------------- 100 ORIGINAL Amount 78 – 45 = 33**Steps for Finding Percent of Change:**• Determine whether the amount is INCREASING or DECREASING from the ORIGINAL amount.**Steps for Finding Percent of Change:**2. Find the amount of CHANGE. SUBTRACT!!! 3. Set-up the Percent Proportion. % Amount of Change --------------------------- = ------------------------- 100 Original Amount**Example 1:**An 8 ft. tree grows to be 10 ft. tall in the last year. What is the tree’s percent of change? Increase or Decrease? 25 2 ft % Amount of Change --------------------------- = ------------------------- 100 8 ft Original Amount**Example 2:**A pair of jeans was originally priced at $40, but is on sale for $36. What is the percent of change? Increase or Decrease? $4 10 % Amount of Change --------------------------- = ------------------------- 100 $40 Original Amount