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Percent Increase and Percent Decrease Problems

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Percent Increase and Percent Decrease Problems. Percent Decrease. A sofa regularly sells for $700.00. Today it is on sale for $630. What is the percent decrease of the price of the sofa?. Percent Decrease. A sofa regularly sells for $700.00. - PowerPoint PPT Presentation

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Page 1: Percent Increase and Percent Decrease Problems

Percent Increase and Percent Decrease Problems

Page 2: Percent Increase and Percent Decrease Problems

Percent Decrease

A sofa regularly sells for $700.00.Today it is on sale for $630. What is the percent

decrease of the price of the sofa?

Page 3: Percent Increase and Percent Decrease Problems

Percent Decrease

A sofa regularly sells for $700.00.Today it is on sale for $630. What is the percent

decrease of the price of the sofa?

First, find the amount of the decrease.

700.00 – 630.00 = 70.00

Page 4: Percent Increase and Percent Decrease Problems

Percent Decrease

A sofa regularly sells for $700.00.Today it is on sale for $630. What is the percent

decrease of the price of the sofa?

The amount of the decrease is 70.00.If you like making an equation to solve,

The question is “70.00 is what percent of 700”?

Page 5: Percent Increase and Percent Decrease Problems

Percent Decrease

A sofa regularly sells for $700.00.Today it is on sale for $630. What is the percent

decrease of the price of the sofa?

“70.00 is what percent of 700”?70 = x(700) divide by 700

x = 1/10 or .10 or 10%

Page 6: Percent Increase and Percent Decrease Problems

Percent Decrease

“70.00 is what percent of 700”?

If you prefer using the percent proportion:P = P that’s what we don’t knowB = 700 “of 700”A = 70

Page 7: Percent Increase and Percent Decrease Problems

Percent Decrease

10070

700 100700 7000

10

A P

BP

P

p

Page 8: Percent Increase and Percent Decrease Problems

When asked to calculate the percent increase or decrease:

Figure out the amount of the increased or decrease

Divide by the original amount

If it went up, it’s an increase.

If it went down, it’s a decrease.


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