Bill Otis noticed that his total mileage for the month was 2,400. He realized that only 600 miles were for family reasons. What percent were for family reasons?

To find the percentage of miles that were for family reasons, we first need to divide the number of family miles by the total miles and then multiply by 100 to get the percentage.

Family miles = 600
Total miles = 2,400

Percentage of family miles = (600/2400) * 100
Percentage of family miles = 0.25 * 100
Percentage of family miles = 25%

Therefore, 25% of Bill Otis' total mileage for the month was for family reasons.