Percent of Change

Front

What is Percent of Change?

Back

Percent of Change is a way to express how much a quantity has increased or decreased in relation to its original amount, calculated as (New Value - Original Value) / Original Value x 100%.

Front

How do you calculate Percent Increase?

Back

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

Front

How do you calculate Percent Decrease?

Back

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

Front

If a ticket price increases from $100 to $120, what is the percent of change?

Back

20% increase.

Front

If a class size changes from 27 to 30 students, what is the percent of change?

Back

11% increase.

Front

If the number of dogs decreases from 20 to 5, what is the percent of change?

Back

75% decrease.

Front

What does a percent decrease indicate?

Back

A percent decrease indicates that the new value is less than the original value.

Front

What does a percent increase indicate?

Back

A percent increase indicates that the new value is greater than the original value.

Front

If Carla's hair cost $154 and she paid $180 total, what percent tip did she leave?

Back

16.9% tip.

Front

What is the formula for finding the original value if you know the percent change and the new value?

Back

Original Value = New Value / (1 + Percent Change) for increase, or Original Value = New Value / (1 - Percent Change) for decrease.