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.

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Presentation transcript:

Percent Increase and Percent Decrease Problems

Percent Decrease A sofa regularly sells for $ 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 $ 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 – = 70.00

Percent Decrease A sofa regularly sells for $ Today it is on sale for $630. What is the percent decrease of the price of the sofa? The amount of the decrease is If you like making an equation to solve, The question is “70.00 is what percent of 700”?

Percent Decrease A sofa regularly sells for $ 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 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

Percent Decrease

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.