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5-4 Applications of Percent

Video Tutor Help Applications of Percent Khan Academy Sales tax

Video Tutor Help Writing percents as fractions Writing percents as decimals Writing decimals as percents Ordering rational numbers with percents Writing fractions as percents Finding a percent using proportions Finding part of a whole using proportions Find the whole amount using proportions Using percent equations to find part of a whole Using percent equations to find a whole amount Finding sales tax Estimating using percents such as tips Finding simple interest Finding percent of increase Finding percent of markup Finding percent of discount

Worksheets Daily Notetaking Guide Worksheets Version A Practice, Guided Problem Solving Lesson 5-4 Practice 5-4 Guided Problem Solving 5-4

Vocabulary Practice Vocabulary (Electronic) Flash Cards Ratios, Rates, and Proportions Vocabulary 5A: Graphic Organizer Vocabulary 5B: Reading Comprehension Vocabulary 5C: Reading/Writing Math Symbols Vocabulary 5D: Visual Vocabulary Practice Vocabulary 5E: Vocabulary C Vocabulary 5F: Vocabulary Review Puzzle

Additional Lesson Examples Step-by-Step Examples Lesson 5-4

Lesson Readiness Lesson Quiz Problem of the Day Lesson 5-4

A video game costs $ The sales tax rate is 5.5%. Find the total cost. LESSON 5-4 Find the sales tax. Round to the nearest cent = 1.92 Add the purchase price to the sales tax = The total cost is $ Applications of Percent Additional Examples

Example 6-4a SALES TAX The price of a sweater is $75. The sales tax is percent. What is the total price of the sweater? Find the amount of the tax t. Words Symbols Equation What amount is of $75? Solve a Real-Life Problem

Example 6-4b Write the equation. Simplify. Answer: The amount of tax is $4.31. The total cost of the sweater is $75 + $4.31 or $79.31.

Use estimation to calculate a 15% tip for each amount. LESSON 5-4 A 15% tip for $34.50 is about $5.25. a. $34.50 Round to the nearest dollar Find 5% of the bill. 5% is of the 10% amount. 3.5 = Add 10% amount and 5% amount to get 15% = 5.25 Find 10% of the bill = 3.5. Applications of Percent Additional Examples

(continued) LESSON 5-4 A 15% tip for $11.84 is about $1.80. b. $11.84 Round to the nearest dollar Find 5% of the bill. 5% is of the 10% amount. 1.2 = Add 10% amount and 5% amount to get 15% = 1.8 Find 10% of the bill = 1.2. Applications of Percent Additional Examples

Find the commission on a $450 sale when the commission rate is 7%. LESSON 5-4 The commission is $31.50 for a $450 sale Change 7% to Simplify. Applications of Percent Additional Examples

Find the total earnings for a salesperson with a salary of $550 plus a 4% commission on sales of $1,485. LESSON 5-4 The salesperson earns $ t = ,485 Write the equation. = Multiply. = Simplify. Applications of Percent Wordstotal earnings = salary + commission Equation t = ,485 Let t = total earnings. Additional Examples

Example 7-4a Jewelry The regular price of a ring is $495. It is on sale at a 20% discount. What is the sale price of the ring? Method 1 First, use the percent equation to find 20% of 495. Estimate: Let d represent the discount. The base is 495 and the percent is 20%. Simplify. Find Discount

Example 7-4b Then, find the sale price. Subtract the discount from the original price. Method 2 Let s represent the sale price. A discount of 20% means the ring will cost or 80% of the original price. Use the percent equation to find 80% of 495.

Example 7-4c The base is 495 and the percent is 80%. Answer:The sale price of the ring will be $396.