A company reduced its workers from 500 to 425. Find the percentage decrease.

The number of workers decreased from 500 to 425.

$$\text{Decrease} = \text{Original number} - \text{New number}$$ $$\text{Decrease} = 500 - 425$$ $$\text{Decrease} = 75$$

The formula for percentage decrease is:

$$\text{Percentage Decrease} = \frac{\text{Decrease}}{\text{Original number}} \times 100\%$$

Substitute the values:

$$\text{Percentage Decrease} = \frac{75}{500} \times 100\%$$

$$\text{Percentage Decrease} = \frac{75}{500} \times 100\%$$

Divide both numerator and denominator by 25:

$$\text{Percentage Decrease} = \frac{3}{20} \times 100\%$$ $$\text{Percentage Decrease} = 0.15 \times 100\%$$ $$\text{Percentage Decrease} = 15\%$$

The percentage decrease is $\boxed{15\%}$.