Why??  Percents are all around us! Sales and discounts shopping Sales Tax Income Taxes Tips on restaurant bills Etc…  When doing problems with % remember.

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Presentation transcript:

Why??  Percents are all around us! Sales and discounts shopping Sales Tax Income Taxes Tips on restaurant bills Etc…  When doing problems with % remember all %’s can become decimals!

The How!  Convert all percentages to decimals i.e. 85% = % = 1.50  Multiply the original cost of an item by the percentage to find the cost of the increase or decrease  Add (taxes, markup, etc) or Subtract (sale, discount, etc) by the amount to find the final price.

Example #1  The original cost of a sweater is $ What is the price after a 20% discount? 20% = * 0.20 = 6.40 $ $6.40 = $25.60

Example #2  A $20,000 car is on sale for 15% off. What is the sale price of the car? 15% = ,000 * 0.15 = 3,000 20,000 – 3,000 = $17,000

Example #3  You and your friends go to Applebee’s for dinner and spend $ If you leave a 18% tip, what is your total cost? 18% = * 0.18 = = $53.37

Example #4  There is a 7.5% sales tax on a $240 TV. How much should you pay? 7.5% = * = = $258

Example #5  Best Buy has a $199 phone on sale for 15% off. Then you have to pay 7% sales tax. How much will it cost? 15% = * 0.15 = – = $ % = * 0.07 = =

Example #6  A $550 computer is on sale for 25% off. How much will the computer cost after a 8.5% sales tax? 25% = * 0.25 = – = % = * = = $447.56