Percent Change and Percent Error

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 - Old Value) / Old Value) x 100.

Front

What is the formula for percent increase?

Back

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

Front

What is the formula for percent decrease?

Back

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

Front

If a price goes from $50 to $60, what is the percent increase?

Back

Percent Increase = ((60 - 50) / 50) x 100 = 20%.

Front

If a price goes from $80 to $60, what is the percent decrease?

Back

Percent Decrease = ((80 - 60) / 80) x 100 = 25%.

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the actual value.

Front

How do you calculate percent error?

Back

Percent Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

If the actual value is 50 and the estimated value is 45, what is the percent error?

Back

Percent Error = (|45 - 50| / 50) x 100 = 10%.

Front

What does a percent error of 0% indicate?

Back

A percent error of 0% indicates that the estimated value is exactly equal to the actual value.