To find the percentage of the seats that are filled, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Number of filled seats}}{\text{Total number of seats}} \right) \times 100 \]
In this case, the number of filled seats is 45,000 and the total number of seats is 60,000. Plugging in the values:
\[ \text{Percentage} = \left( \frac{45,000}{60,000} \right) \times 100 \]
Calculating the fraction:
\[ \frac{45,000}{60,000} = 0.75 \]
Now, converting the fraction to a percentage:
\[ 0.75 \times 100 = 75% \]
So, 75% of the seats are filled.