Presentation on theme: "Solving problems involving discounts at sales and sales tax."— Presentation transcript:
1Solving problems involving discounts at sales and sales tax. Number Sense 1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.Objective: Students will find the discount and sale price of an item and find the tax and total price of an item after taxes.
2California Blue Prints Number Sense2539%Standard Set 1.0* Students compare and order positive and negative fractions, decimals, and mixed numbers. Students solve problems involving fractions, ratios, proportions, and percentages:1.1* Compare and order positive and negative fractions, decimals, and mixed numbers and place them on a number line.31.2* Interpret and use ratios in different contexts (e.g., batting averages, miles per hour) to show the relative sizes of two quantities, using appropriate notations (a/b, a to b, a:b).11.3* Use proportions to solve problems (e.g., determine the value of N if 4/7 = N/21, find the length of a side of a polygon similar to a known polygon). Use cross- multiplication as a method for solving such problems, understanding it as the multiplication of both sides of an equation by a multiplicative inverse.61.4* Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.5
3How to find the sales tax! First find out what tax rate you will be paying.In California the tax rate is 8.25%!Convert your percentage to a decimal by moving your decimal two spaces to the left.Ex % = (Don’t forget to add a zero)Multiply the decimal form of the tax rate by the price of the item you are purchasing.Ex x $ cost of the item
4How to find the sales tax! So if an item costs $5.00Sales tax is 8.25%Convert 8.25% to .0825So x $5 = $.41The sales tax is $.41But the total price of the item is$ $.41 = $5.41
5How to find the Discount & Discounted Price Find out the % of the discount. Convert the % to a decimal.Multiply the decimal by the original price.Take the answer in step 2 and subtract it from the original price.ExampleDiscount 20% = .20,$10 x .20 = $2.00$ $2.00 = $8.00
6Please randomly add all these number to your sheet of paper. $50.00149.99$162.36$9.20$239.19$.74$165.35$189.99$71.20$17.80$53.04$4.04$48.71$3.71$10.83$.83
7The object of the game: Solve the math problem. Cross out the answer on the bingo card.The first three students with four in a row win!
8Hollister Shirt $10 The tax is 8.25% 1. How much would you spend on taxes for this shirt?$.832. What would be the total cost of this shirt?$10.83
9$45.00 iPod shuffle 1GB tax rate = 8.25% 3. What will the sales tax be if you purchase this item?$3.714. What will the total price be if you purchase this item?$48.71
10E-matic 4GB Video MP3 Player with 2 E-matic 4GB Video MP3 Player with 2.4" Screen, Camera and Video Recorder $49.00Tax rate 8.25%5. What will be the total of the state sales tax?$4.046. What will be the total price of the MP3 Player after the state tax of 8.25% is applied?$53.04
11If this Tony Romo Jersey was 20% off, 7. What would the discount be. 8 If this Tony Romo Jersey was 20% off, 7. What would the discount be? 8. What would be the sale price?Tony Romo Jersey $89
12Xbox 360 for $199.99 The Discount is 25% 9. What is the discount? $ 50.0010. What is the price after the discount?$149.9911. What is the price after the discount and after taxes?$162.36
13Ipod Touch for $229.99 The tax rate is 4% 12. What is the tax? $ 9.20 13. What is the total price after taxes?$239.19
14To download this PowerPoint: Go to $239.19$.83$50.00$189.99$4.04$3.71$165.35$53.04$149.99$10.83$162.36$9.20$71.20$.74$17.80$48.71To download this PowerPoint: Go to