Percents of Numbers
Three of the 25 students in an art class are left-handed. In other words, 12% of the students are left-handed.
The number 3 represents ______ of the class.
Part
Decide whether following situation is looking for the percent, the part, or the whole:
The 14 compact cars sold by a dealer on Monday was 56% of the cars sold that day.
Then, write a proportion to represent the situation.
Whole
14/w = 56/100
What is the percent equation?
part/whole = percent
Write an expression that can be used to find the price of a $400 telescope after a 32% markup.
400*1.32
400 + 400*0.32
Percent Error
Are the ratios equivalent or not equivalent?
1. 2/5 and 20/100
2. 3/6 and 50/100
3. 150/600 and 40/100
1. Not Equivalent
2. Equivalent
3. Not Equivalent
Write a proportion to find 65% of 90.
65/100 = x/90
Tyson multiples 75 by 1.15. What percent is Tyson trying to find?
115%
Emily bought a pair of headphones on sale. If they usually cost $36.80, and Emily purchased them at 40% off, how much did she pay?
$22.08
____________ = ______________ * interest rate
Simple interest = principal * interest rate
There are 99 males and 121 females participating in a marathon. What percent of the participants are female?
55%
Jason was asked 40 questions on a quiz show. He answered 85% of the questions correctly. How many questions did he answer?
34
875ALL
The school store buys granola bars for 40ALL each and sells them for 65ALL. What is the percent markup?
62.5%
Tony's deposit earned $40.80 in simple interest over 3 years in an account with an interest rate of 1.7%. How much did Tony deposit?
$800
When a flower was first planted in a garden, it was 12 cm tall. After two weeks, it was 120% as tall as it was when it was first planted. How tall was the flower after the two weeks?
14.4 cm
Annette is surveying people in the city about their interest in a new shopping mall. She found that 180 people, or 37.5% of those surveyed, do not want a new mall. How many people did Annette survey?
480
Find the percent:
132 is what percent of 880?
15%
A laptop was originally sold for $975. The laptop is now on sale for $828.75. What is the percent markdown?
15%
Aiden estimates that the length of a piece of rope is 7.2 cm. If its actual length is 6.5 cm, what is the percent error of Aiden's estimate?
10.77%
Kevin's car can go 315 miles on one tank of petrol. He used just under 40% of a full tank of petrol to get to a sporting event, traveling at an average speed of 60 miles in an hour. About how long did it take for him to get there?
About 2 hours
When a volcano erupts, the height of the peak is reduced, and the upper portion is removed. The height of a volcano after it erupted was 8,219.5 feet. This was 85% of the original height. What was the original height?
9,670 feet
There are 65 students who walk to West Middle School each day. This is 12.5% of the total number of students at the school. How many students attend West Middle School?
520 students
360 is increased by 25%. The result is then decreased by 50%. What is the final number?
225
$3,120