1. The problem asks for the percent of change from 5 to 1. 2. The formula for percent change is: $$\text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100\%$$ 3. Substitute the values: old value = 5, new value = 1. $$\text{Percent Change} = \frac{1 - 5}{5} \times 100\% = \frac{-4}{5} \times 100\%$$ 4. Simplify the fraction: $$\frac{-4}{5} = -\frac{4}{5}$$ 5. Calculate the percentage: $$-\frac{4}{5} \times 100\% = -80\%$$ 6. A negative percent change means a decrease. 7. Therefore, the percent of change from 5 to 1 is an 80% decrease.