To find what percent 540 is of 750, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the part is 540 and the whole is 750. Plugging in the values:
\[ \text{Percentage} = \left( \frac{540}{750} \right) \times 100 \]
Now, calculate the fraction:
\[ \frac{540}{750} = 0.72 \]
Now, multiply by 100 to convert to a percentage:
\[ 0.72 \times 100 = 72 \]
Thus, 540 is 72% of 750.