Lesson 6 Practice Problems

Transcription

1 Lesson 6 Skills Practice 1. Solve the proportions. Simplify your answers. Show all work p 12 a. b. x c. 11 m d w 2. Complete the missing parts of the table. Decimal Percent % 100% %

2 3. For each of the following, first translate the given statement into a percent equation, then solve the equation. Show all steps. a. 45% of 27 is what number? b. 50 is what percent of 80? Equation: Solve: Equation: Solve: c. 67 is 80% of what number? d. 300 is what percent of 48? Equation: Solve: Equation: Solve: 4. Calculate the percent change for each of the following. Show all work. a. A quantity decreases from 15 to 10 b. A quantity increases from 10 to 15

3 Applications For each of the following, underline the Givens and circle the Goal of the problem. Form a Strategy, Solve, and Check. Show all work, and write your answer in a complete sentence. 5. Amber is baking cupcakes for a school fundraiser, and wants to sell them for five times the cost of making them. The ingredients cost $11.22, and the recipe makes 24 cupcakes. Write an equation to represent this situation, and use it to determine the amount of money Amber should charge for each cupcake. 6. A new Sony 55 3D television set costs $2,499. You are going to pay $600 as a down payment, and pay the rest in equal monthly installments for one year. Write an equation to represent this situation, and use it to determine how much you should pay each month. 7. Your yard is a mess, and you decide to hire a landscaper. The Greenhouse charges a $20 consultation fee plus $11 per hour for the actual work. Garden Pros does not charge a consulting fee, but charges $15 per hour for the actual work. Write an equation that will help you determine the number of hours at which the two companies charge the same. Solve the equation, and write your answer in a complete sentence.

4 8. The scale on a map is 1 inch to 75 miles. Find the actual distance between two towns that are inches apart on the map. Set up a proportion to represent this situation. Solve, and write your answer in a complete sentence. 9. An 8 fluid ounce serving of PowerAde contains 72 calories. How many calories are in 30 fluid ounces of PowerAde? Set up a proportion to represent this situation. Solve, and write your answer in a complete sentence. 10. Megan makes $32,500 per year. Every day, she stops by Starbucks and spends an average of $4 on coffee. What percent of her income is spent on Starbucks? Round your answer to the nearest tenth of a percent.

5 11. One banana contains about 425mg of potassium. That is about 13% of the dailyrecommended amount of potassium. a. How much potassium (in mg) should be consumed daily? b. How many bananas would you need to eat each day in order to consume this much potassium? 12. Jon has 892 points in his math class. To earn an A in the class, he must have 90% of the 1180 points possible by the end of the term. How many more points must he earn by the end of the term to receive an A in the class? 13. The bill for dinner (after tax) was $ You decide to leave a 15% tip. Calculate the total amount paid.

6 14. A clothing store is having a 40% off sale on all its merchandise. A customer bought an item that originally cost $80. a. What was the sale price of the item? b. Calculate the total amount the customer paid after a 9% sales tax was added to the purchase.

7 Extension 15. Justin receives a 10% pay cut followed by a 10% pay raise. His salary after the raise is a. More than his original salary b. The same as his original salary c. Less than his original salary. Explain your reasoning. 16. It is the day after Thanksgiving (Black Friday!), and April is at Kohls, standing in the very long line waiting to check out. She has two coupons, the first is for 10% off her entire purchase. The second is for $10 off her entire purchase. April estimates that she has well over $200 worth of merchandise in her cart. a. Assuming that only one of her coupons can be applied to her purchase, which one should she use? Show all mathematical work and explain your answer. b. Assuming that both of the coupons can be applied to her purchase, which one should she show to the cashier first? Show all mathematical work and explain your answer.

8 17. Consider the proportion x a. Write a story problem for the proportion above. b) Solve your problem showing all possible steps. Write your answer in a complete sentence.