Percent Change and 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 does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in value.

Front

What is percent error?

Back

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

Front

How do you calculate percent error?

Back

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

Front

If the actual value is 100 and the estimated value is 90, what is the percent error?

Back

Percent Error = (|90 - 100| / 100) x 100 = 10%.

Front

What is the formula for calculating the new value after a percent increase?

Back

New Value = Original Value x (1 + Percent Increase).

Front

What is the formula for calculating the new value after a percent decrease?

Back

New Value = Original Value x (1 - Percent Decrease).

Front

If a price increases from $50 to $75, what is the percent change?

Back

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