Percent Increase Percent Decrease

​Percent Increase & Decrease

Pay Attention

Answer all questions ​

​Percent Increase

A percent increase occurs when the new amount is greater than the original amount, such as when stores mark up the price they pay for an item to make a greater profit.​

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All That Glitters Jewelry Store marks up its prices so it can

maximize its profits. What is the percent increase for each

item? Use the formula shown to complete the table.

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​Percent Decrease

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A percent decrease occurs when the new amount is less than the

original amount. An example of a percent decrease is the amount water

evaporates over time. Water evaporates at different rates, depending

on the size and shape of the container it is in and the air temperature.

​

A science class is conducting an experiment to determine how

fast water evaporates. They fill 4 differently shaped containers

with water and measure the level once at the beginning of the

experiment and once at the end. Use the formula shown to

complete the table.

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Multiple Choice

What is the difference (cm) for container A?

• 2.6 cm

• 11.6 cm

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Multiple Choice

What is the difference (cm) for container B?

• 3.2 cm

• 1.4 cm

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Multiple Choice

What is the difference (cm) for container C?

• 6.7 cm

• 0.9 cm

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Multiple Choice

What is the difference (cm) for container D?

• 1.6 cm

• 16.8 cm

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Poll

How would you describe a 50 percent decrease?

• The new number is half more the original amount.

• The new number is half less the original amount.

Poll

How would you describe a 100 percent increase?

• The new number is double the original amount

• You add 100 to the original amount.

​How to find the percent increase and decrease?

​Percent Decrease

​Percent Increase

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​Depreciation and Proportionality

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Generally, things like homes and savings accounts gain value, or

appreciate over time. Other things, like cars, depreciate every year.

New cars depreciate about 12% of their value each year

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Appreciation is an

increase in price or

value.

​

​

Depreciation is a

decrease in price or

value.​

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Multiple Choice

How much would a new car depreciate the first year if it costs:

$ 35,000

(New cars depreciate about 12% of their value each year)

• $4,000

• $4,200

• $30,800

• $39,200

Multiple Choice

How much would a new car depreciate the first year if it costs:

$ 20,000

(New cars depreciate about 12% of their value each year)

• $2,200

• $17,600

• $22,400

• $2,400

Multiple Choice

If a car lost $3600 in depreciation in the first year, what is the original cost of this car?

(New cars depreciate about 12% of their value each year)

• $432

• $30,000

• $43,200

• $36,000

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Open Ended

Describe how the value of the car decreases over time.

Poll

Is the relationship between time and the car's value

proportional?

• Yes, it starts at the top and it looks straight.

• No, it does not go through the origin and it's not straight.