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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.

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Percent increase and percent decrease problems

Percent Increase and Percent Decrease Problems


Percent decrease
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 decrease1
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


Percent decrease2
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”?


Percent decrease3
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%


Percent decrease4
Percent Decrease

  • “70.00 is what percent of 700”?

  • If you prefer using the percent proportion:

    • P = P that’s what we don’t know

    • B = 700 “of 700”

    • A = 70



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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