7-6 Percent of Change
GASOLINE A survey of gas prices in January showed that the cost per gallon one year was $2.649. The following
January, the cost per gallon was $2.999. 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 $76.80.
bracelet: $26.50, 35% markup
Let m represent the amount of the markup.
Add the markup to the cost.
26.50 + 9.28 = 35.78
The selling price of the bracelet is $35.78.
jacket: $25; 32% markup
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Use the percent equation to find 100% + 32% or 132% of the price. Let p represent the selling price.
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7-6
Add the markup to the cost.
26.50
+ 9.28of
= 35.78
Percent
Change
The selling price of the bracelet is $35.78.
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 $33.00.
stereo: $55, 40% markup
Let m represent the amount of the markup.
Add the markup to the cost.
55 + 22 = 77
The selling price of the stereo is $77.00.
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 $18.85.
phone: $34, 36% markup
Let m represent the amount of the markup.
Add the markup to the cost.
34 + 12.24 = 46.24
The selling price of the phone is $46.24.
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 $598.80.
mountain bike: $255, 34% mark up
Let m represent the amount of the markup.
Add the markup to the cost.
255 + 86.70 = 341.70
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mountain bike is $341.70.
SALONS A salon is having a sale on their hair products. Find the sale price of the shampoo and conditioner set
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Use the percent equation to find 100% + 20% or 120% of the price. Let p represent the selling price.
7-6 Percent of Change
The selling price of the television is $598.80.
mountain bike: $255, 34% mark up
Let m represent the amount of the markup.
Add the markup to the cost.
255 + 86.70 = 341.70
The selling price of the mountain bike is $341.70.
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.
10 2.50 = 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%
Let s represent the sale price.
35% or 65%. Find 65% of $30.
The sale price of the plan is $19.50.
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%
or 80%. Find 80% of 3860. Let n represent the number of calls on the second night.
20%
There were 3088 calls on the second night.
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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.
If the amount of the discount is 35%, the percent the customer will pay is 100%
Let s represent the sale price.
35% or 65%. Find 65% of $30.
7-6 Percent of Change
The sale price of the plan is $19.50.
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%
or 80%. Find 80% of 3860. Let n represent the number of calls on the second night.
20%
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 2006. Round to the nearest tenth.
The percent of change is approximately 11.7%.
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.
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7-6 Percent of Change
The percent of change is approximately 11.7%.
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%.
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