Presentation on theme: "Solving problems involving discounts at sales and sales tax."— Presentation transcript:
1 Solving 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.
2 California 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
3 How 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
4 How 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
5 How 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
6 Please 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
7 The 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!
8 Hollister 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
10 E-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
11 If 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
12 Xbox 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
13 Ipod 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
14 To 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