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Juan paid $160 for a new lawn mower. A year later, he sold the mower for $136.
What is the percent decrease in the value of the lawn mower?
RememberThe formula used to find the percent of change is percent of change = over amount of change times 100% percent of change = amount of changeoriginal amount⋅100%percent of change = amount of changeoriginal amount·100% .
Find the amount of change.
160−136 equals 24 160−136=24160−136=24
How do you find the amount of change?
Find the difference between the two values.
Use the percent of change formula.
over amount of change equals over 24 equals over 3 amount of changeoriginal value=24160=320amount of changeoriginal value=24160=320
How do you find the percent of decrease?
Identify the original value and use the formula for percent of change.
Change the fraction to a percent.
over 3 times 100% equals over 3 times over 100% 320⋅100%=320⋅1001%
320·100%=320·1001%
equals over 3 times over 1005% =3201⋅10051%
=3201·10051%
equals over 3 times over 5% =31⋅51%
=31·51%
equals over 15% =151%
=151%
equals 15% =15%
=15%
How do you change a fraction to a percent?
Multiply the fraction by 100%.
Write the solution.
There is a 15% decrease between the original purchase price of the lawn mower and the sales price 1 year later.
When you solve a real-world problem, how should you write the answer?
Write the answer as a complete sentence.
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