To find the percentage of students who are boys, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Number of boys}}{\text{Total number of students}} \right) \times 100 \]
In this case, there are 47 boys out of 100 students. Plugging in the numbers:
\[ \text{Percentage} = \left( \frac{47}{100} \right) \times 100 \]
Calculating this gives:
\[ \text{Percentage} = 47% \]
Therefore, 47% of the students are boys.