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Solve. Round to the nearest whole percent.

Veronica is planning to make muffins from a mix. The package says each muffin will be 230 calories and 60 calories will be from fat. What percent of the total calories is from fat?

26%

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Solve. Round to the nearest whole percent.

The mix Ricardo plans to use to make brownies says that each brownie will be 190 calories, and 76 calories are from fat. What percent of the total calories are from fat?

40%

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Find percent increase and percent decrease

People in the media often talk about how much an amount has increased or decreased over a certain period of time. They usually express this increase or decrease as a percent.

To find the percent increase , first we find the amount of increase, the difference of the new amount and the original amount. Then we find what percent the amount of increase is of the original amount.

Find the percent increase.

  1. Find the amount of increase.
    new amount original amount = increase
  2. Find the percent increase.
    The increase is what percent of the original amount?

In 2011, the California governor proposed raising community college fees from $26 a unit to $36 a unit. Find the percent increase. (Round to the nearest tenth of a percent.)

Solution

Step 1. Read the problem.
Step 2. Identify what we are looking for. the percent increase
Step 3. Name what we are looking for.
Choose a variable to represent it. Let p = the percent.
Step 4. Translate. Write a sentence that gives the information to find it.
First find the amount of increase. new amount − original amount = increase
36 26 = 10
Find the percent. Increase is what percent of the original amount?
.
Translate into an equation. .
Step 5. Solve the equation. .
Divide by 26. .
Change to percent form; round to the nearest tenth. .
Step 6. Check. Does this make sense?
Yes, 38.4% is close to 1 3 , and 10 is close to 1 3 of 26.
Step 7. Answer the question with a complete sentence. The new fees represent a 38.4% increase over the old fees.

Notice that we rounded the division to the nearest thousandth in order to round the percent to the nearest tenth.

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Find the percent increase. (Round to the nearest tenth of a percent.)

In 2011, the IRS increased the deductible mileage cost to 55.5 cents from 51 cents.

8.8%

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Find the percent increase.

In 1995, the standard bus fare in Chicago was $1.50. In 2008, the standard bus fare was $2.25.

50%

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Finding the percent decrease is very similar to finding the percent increase, but now the amount of decrease is the difference of the original amount and the new amount. Then we find what percent the amount of decrease is of the original amount.

Find the percent decrease.

  1. Find the amount of decrease.
    original amount new amount = decrease
  2. Find the percent decrease.
    Decrease is what percent of the original amount?

The average price of a gallon of gas in one city in June 2014 was $3.71. The average price in that city in July was $3.64. Find the percent decrease.

Solution

Step 1. Read the problem.
Step 2. Identify what we are looking for. the percent decrease
Step 3. Name what we are looking for.
Choose a variable to represent that quantity. Let p = the percent decrease.
Step 4. Translate. Write a sentence that gives the information to find it.
First find the amount of decrease. 3.71 3.64 = 0.07
Find the percent. Decrease is what percent of the original amaount?
.
Translate into an equation. .
Step 5. Solve the equation. .
Divide by 3.71. .
Change to percent form; round to the nearest tenth. .
Step 6. Check. Does this make sense?
Yes, if the original price was $4, a 2% decrease would be 8 cents.
Step 7. Answer the question with a complete sentence. The price of gas decreased 1.9%.
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Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
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cm
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what is physics
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Can you compute that for me. Ty
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what is viscosity?
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what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
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please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
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can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
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"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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Maurice
answer
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progressive wave
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hello friend how are you
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fine, how about you?
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hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Who can show me the full solution in this problem?
Reofrir Reply
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Practice Key Terms 9

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Source:  OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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