Final answer:
The percentage of commercials in each hour of prime-time programming is 15%.
Step-by-step explanation:
To find the percentage of commercials in each hour of prime-time programming, we need to compare the length of commercials to the length of an hour.
There are 60 minutes in an hour, and the television station allocates 9 minutes to commercials.
So, the percentage of commercials in each hour of prime-time programming is calculated as:
(9/60) x 100% = 15%
Therefore, 15% of each hour of prime-time programming is commercials.