To calculate the percent change from 55 to 11, you can use the following formula:
\[ \text{Percent Change} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100 \]
In this case, the old value is 55 and the new value is 11. Plugging in these values:
\[ \text{Percent Change} = \left( \frac{11 - 55}{55} \right) \times 100 \]
\[ \text{Percent Change} = \left( \frac{-44}{55} \right) \times 100 \]
\[ \text{Percent Change} = -0.8 \times 100 = -80 \]
So, the percent change from 55 to 11 is -80%. This indicates a decrease of 80%.