USING PERCENTS AND CALCULATING PERCENT CHANGE Objectives: SWBAT do calculations using percents. SWBAT find percents of increase and decrease. SWBAT use.

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USING PERCENTS AND CALCULATING PERCENT CHANGE Objectives: SWBAT do calculations using percents. SWBAT find percents of increase and decrease. SWBAT use percent change to find initial or final values.

Percents  A percent is a ratio out of 100.  Example: In the Uplift class of 2012, about 64% of the students are female. If there are 96 students in the class, how many girls are there?  64=x64*96 = 100x = 100x = x There are 61 girls in the class.

Ex. : State whether each percent of change is a percent of decrease or increase. Then find the percent of change. 1. initial: 32 final: – 32 = 8 8= > 25% initial: 20 final: 4 4 – 20 = = = -80% 20

Vocabulary  Percent: a fraction out of 100  Percent of change: an increase or decrease expressed at a percent.  Percent of increase: the percent by which new number is greater than the original number.  Percent of decrease: the percent by which the new number is less than the original number.

Percent of Change Formula Percent of Change: final amount – initial amount initial amount

You TRY!!!! 3. initial: 72 final: – 72 = = -0.5 = - 50% initial: 45 final: – 45 = 5 5= = 11.1% 45

Using Percent Change  To calculate final value, use (1 + c) * initial value. c = % change written as a decimal  Example: A store is having a 20% off sale. How much does a shirt that was $60 cost?  Initial value: $60  Percent change: -20% = -.2  ( ) * $60 =  0.8 * $60 = $48

Ex: Using Percent Change 1. The price a used-book store pays to buy a book is $5. The store sells the book for 28% above the price that it pays for the book. What is the selling price of the $5 book?

Ex: Find the total price of each item. 1. Software: $39.50 Sales tax: 6.5% 2. Compact disc: $15.99 sales tax: 5.75%

Ex: Find the discounted price of each item. 1. jeans: $45.00 discount: 25% 2. book: $19.95 discount: 33%

Ex: Find the final price of each 1. lamp: $ discount: 20% tax: 6% 2. camera: $58.00 discount: 25% tax: 6.5%

In 1987, the United States had 2 million active-duty military personnel. By 2000, there were only 1.4 million active-duty military personnel. What was the percent of decrease? Practice

In order for a food to marked “reduced fat,” it must have at least 25% less fat than the same full-fat food. If one ounce of reduced fat chips has 6 grams of fat, what is the least amount of fat in one ounce of regular chips?