6-4 Percent of Change

Front

What is percent change?

Back

Percent change is a measure of how much a quantity has increased or decreased relative to its original value, expressed as a percentage.

Front

How do you calculate percent change?

Back

Percent Change = ((New Value - Original Value) / Original Value) x 100.

Front

What is the formula for percent increase?

Back

Percent Increase = ((New Value - Original Value) / Original Value) x 100.

Front

What is the formula for percent decrease?

Back

Percent Decrease = ((Original Value - New Value) / Original Value) x 100.

Front

If the price of an item increases from $50 to $75, what is the percent increase?

Back

Percent Increase = ((75 - 50) / 50) x 100 = 50%.

Front

If the attendance at a concert was estimated to be 200 but was actually 170, what is the percent error?

Back

Percent Error = |(Estimated - Actual) / Estimated| x 100 = |(200 - 170) / 200| x 100 = 15%.

Front

What does a 600% increase mean?

Back

A 600% increase means the new value is 6 times greater than the original value, plus the original value.

Front

If a student scored 80 out of 100 on a test, what is the percent score?

Back

Percent Score = (Score / Total) x 100 = (80 / 100) x 100 = 80%.

Front

What is the percent change if a population grows from 1,000 to 1,500?

Back

Percent Change = ((1500 - 1000) / 1000) x 100 = 50% increase.

Front

If a car's value decreases from $20,000 to $15,000, what is the percent decrease?

Back

Percent Decrease = ((20000 - 15000) / 20000) x 100 = 25%.