Percent of Change Decrease (Discount)

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Presentation transcript:

Percent of Change Decrease (Discount)

digital camera: $265, 30% markup Warm-Up Find the selling price for the item given the percent of markup. digital camera: $265, 30% markup 100% = 50% = 25% = 10% = 5% = 1% =

Percent of Change The percent that an amount changes from its original amounts is called the percent of change. To find the percent of change, do the following: Step 1 Subtract to find the amount of change. Step 2 Write the ratio as a decimal. Step 3 Write the decimal as a percent. amount of change original amount

Increase or Decrease When the new amount is greater than the original, the percent of change is a percent of increase. When the new amount is less than the original, the percent of change is called a percent of decrease.

Find the Percent of Change Maria had 20 comic books. She gave some to her friend. Now she has 13 comic books. Find the percent of change. Is the percent of change an increase or decrease? Step 1 The amount of change is 20 – 13 or 7. Step 2 percent of change = = = 0.35 Step 3 The decimal 0.35 written as a percent is 35%. So the percent of change is 35%. Since the new number of members is less than the original, it is a percent of decrease. amount of change original amount 7 20

Original: 10 dogs New: 5 dogs Example Problem Find each percent of change. Round if necessary. Original: 10 dogs New: 5 dogs

Original: 30 books New: 2 books Example Problem Find each percent of change. Round if necessary. Original: 30 books New: 2 books

Find the Sales Price Calculate the Percent: 35% of $95 = 33.25 Academy is having a sale. A snowboard has an original price of $95. It is on sale for 35% off the original price. Find the sale price of the snowboard. Calculate the Percent: 35% of $95 = 33.25 Subtract from Original: $95 – $33.25 Sales Price = $61.75 The sales price of the snowboard is $61.75.

Example Problem 100% = 50% = 25% = 10% = 5% = 1% = Find the sale price of each item to the nearest cent. CD: $14.50, 10% off 100% = 50% = 25% = 10% = 5% = 1% =

Example Problem 100% = 50% = 25% = 10% = 5% = 1% = Find the sale price of each item to the nearest cent. Sweater: $40.00, 25% off 100% = 50% = 25% = 10% = 5% = 1% =

Percent of Change: Decrease Up Next… Activity 1: Percent of Change: Decrease