7-6 Percent of Change

Transcription

1 GASOLINE A survey of gas prices in January showed that the cost per gallon one year was $ The following January, the cost per gallon was $ Find the percent change in gas prices from one year to the next to the nearest tenth. The percent of change is approximately 13.2%. FOOTBALL Jerome High School s football team scored 38 points in their first game. The next week they only scored 17 points. Find the percent change in the number of points scored by the football team to the nearest tenth. The percent of change is approximately 55.3%. Find the selling price for each item given the cost and the percent of markup. video game: $60; 28% markup Use the percent equation to find 100% + 28% or 128% of the price. Let p represent the selling price. The selling price of the video game is $ bracelet: $26.50, 35% markup = The selling price of the bracelet is $ esolutions Manual - Powered by Cognero Page 1

2 jacket: $25; 32% markup Use the percent equation to find 100% + 32% or 132% of the price. Let p represent the selling price. The selling price of the jacket is $ stereo: $55, 40% markup = 77 The selling price of the stereo is $ wallet: $14.50, 30% markup Use the percent equation to find 100% + 30% or 130% of the price. Let p represent the selling price. The selling price of the wallet is $ phone: $34, 36% markup = The selling price of the phone is $ television; $499, 20% markup Use the percent equation to find 100% + 20% or 120% of the price. Let p represent the selling price. The selling price of the television is $ esolutions Manual - Powered by Cognero Page 2

3 mountain bike: $255, 34% mark up = The selling price of the mountain bike is $ SALONS A salon is having a sale on their hair products. Find the sale price of the shampoo and conditioner set shown below that regularly costs $10. Let d represent the amount of the discount. Subtract the discount from the original cost to find the sale price = 7.50 The sale price of the shampoo and conditioner set is $7.50. ENTERTAINMENT The unlimited rental plan at a video store costs $30 a month. It is on sale for 35% off the original price. What is the sale price of the plan? If the amount of the discount is 35%, the percent the customer will pay is 100% 35% or 65%. Find 65% of $30. Let s represent the sale price. The sale price of the plan is $ esolutions Manual - Powered by Cognero Page 3

4 TELEVISION For the local telethon 3860 viewers called in and donated money on the first night. The next night, there was a 20% decrease in the number of calls from the first night. How many calls did the telethon receive on the second night? If the amount of the decrease is 20%, the percent of callers from the first night to the second night is 100% 20% or 80%. Find 80% of Let n represent the number of calls on the second night. There were 3088 calls on the second night. OLYMPICS There were 10,651 athletes who participated in the 2000 Summer Olympics in Sydney, Australia. In the 2004 Summer Olympics in Athens, Greece, 11,099 athletes participated. What was the percent of change in the number of athletes participating from 2000 to 2004? Round to the nearest tenth. The percent of change is approximately 4.2%. BICYCLING According to the National Sporting Goods Association, the number of people who participated in bicycle riding in 2004 was 40.3 million. In 2006, the number was 35.6 million. Find the percent of change from 2004 to Round to the nearest tenth. The percent of change is approximately 11.7%. esolutions Manual - Powered by Cognero Page 4

5 DOGS Kyla s boxer weighs about 62 pounds. When it was a puppy it only weighed 23 pounds. What is the percent of change in we. Round to the nearest tenth. The percent of change is about 169.6%. esolutions Manual - Powered by Cognero Page 5