Final answer:
To determine the percentage of guests who bought only day passes, divide the number of day pass buyers by the total number of guests and multiply by 100. In this case, 16 2/3% of the guests bought only day passes.
Step-by-step explanation:
To calculate what percentage of guests bought only day passes at the amusement park, we need to divide the number of guests who bought only day passes by the total number of guests and then multiply by 100 to get the percentage.
Total number of guests = Guests who bought day passes + Guests who bought ride tickets + Guests who bought food
Total number of guests = 20 day pass buyers + 60 ride ticket buyers + 40 food buyers = 120 guests
To find the percentage who bought only day passes:
Percentage = (Number of day pass buyers / Total number of guests) × 100
Percentage = (20 / 120) × 100 = (1 / 6) × 100 = 16.67%
Therefore, the percentage of guests who bought only day passes during this hour is 16 2/3%, which corresponds to option D.