To find the experimental probability that a person selected at random is going to City A, you can use the formula for experimental probability:
\[ P(\text{City A}) = \frac{\text{Number of responses for City A}}{\text{Total number of responses}} \]
From the data provided:
- Number of responses for City A = 28
- Total number of responses = 100
Now, substituting the values into the formula:
\[ P(\text{City A}) = \frac{28}{100} \]
To simplify \(\frac{28}{100}\), divide both the numerator and the denominator by their greatest common divisor, which is 4:
\[ P(\text{City A}) = \frac{28 \div 4}{100 \div 4} = \frac{7}{25} \]
Thus, the experimental probability that a person selected at random is going to City A is:
\[ \boxed{\frac{7}{25}} \]