To find the percentage of shoes that are rejected, you can use the following formula:
\[ \text{Percentage rejected} = \left( \frac{\text{Number of rejected pairs}}{\text{Total number of pairs}} \right) \times 100 \]
In this case, the number of rejected pairs is 3 and the total number of pairs is 200. Plugging these values into the formula gives:
\[ \text{Percentage rejected} = \left( \frac{3}{200} \right) \times 100 \]
Now, calculate the fraction:
\[ \frac{3}{200} = 0.015 \]
Now multiply by 100 to get the percentage:
\[ 0.015 \times 100 = 1.5% \]
Therefore, 1.5% of the shoes are rejected.