Final answer:
To find the number of on-time flights, multiply the number of arrival flights by the percentage of on-time flights after converting the percentage to a decimal.
Step-by-step explanation:
To find the number of on-time flights, given the total number of arrival flights and the percentage of on-time flights, one would use option a), which is to multiply the number of arrival flights by the percentage of on-time flights. If you know that 80% of the flights arrive on time and there are 100 arrival flights, then you calculate 0.80 (or 80/100) times 100 arrival flights to find that 80 flights arrived on time. Make sure to convert the percentage to a decimal before multiplying.