Change expressed as a percent

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Presentation transcript:

Change expressed as a percent Objective: How to calculate a percent change

Percent Change The ratio of the amount of change to the original amount expressed as a percent. If a new amount is greater than the original amount, the percent change is called a Percent increase: the percent change found when the original amount increases. If the new amount is less than the original amount, the percent change is called a Percent decrease: the percent change found when the original amount decreases.

Calculate a percent change 1. A coat is on sale. The original price of the coat is $82. The sale price is $74.50. What is the discount expressed as a percent change?

Calculate a percent change 2. The average monthly precipitation for Chicago, Illinois, peaks in June at 4.1 inches. The average monthly precipitation in December is 2.8 inches. What is the percent of decrease from June to December?

Calculate a percent change 3. A store buys an electric guitar for $295. The store marks up the price of the guitar to $340. What is the markup expressed as a percent of change?

Calculate a percent change 4. In one year, the toll for passenger cars to use a tunnel rose from $3 to $3.50. What was the percent increase?

Do you understand? Determine whether each situation involves a percent increase or a percent decrease. A) A hat that originally costs $12 sold for $9.50 B) You buy a CD for $10 and sell it for $8 C) A store buys glasses wholesale for $2 per glass. The store sells them for $4.50

Percent change Ws 12 questions