The first set of statements is the correct approach to find 45 percent of 75:
- Write 45 percent as 9 × 5 percent, and write 5 percent as \( \frac{1}{20} \).
- Then, find \( \frac{1}{20} \) of 75:
- \( 75 \times \frac{1}{20} = \frac{75}{20} = 3.75 \).
- Multiply 3.75 by 9 to get 33.75.
- So, 45 percent of 75 is 33.75.
This method accurately calculates 45 percent of 75.
The other options contain incorrect calculations or misinterpretations of percentages.