To calculate the percentage decrease in the price of the shoes, you can use the following formula:
\[ \text{Percentage decrease} = \left( \frac{\text{Original Price} - \text{New Price}}{\text{Original Price}} \right) \times 100 \]
In this case, the original price is $24 and the new price is $20.
First, calculate the decrease in price:
\[ \text{Decrease in price} = 24 - 20 = 4 \]
Now, substitute the values into the formula:
\[ \text{Percentage decrease} = \left( \frac{4}{24} \right) \times 100 \]
Calculating this gives:
\[ \text{Percentage decrease} = \left( \frac{1}{6} \right) \times 100 \approx 16.67 \]
Thus, the price of the pair of shoes was reduced by approximately 16.67%.