Final answer:
7/8 of radio airtime is not commercials, and 12.5% of radio airtime is commercials.
Step-by-step explanation:
If commercials make up one eighth of radio airtime, then the remainder of the airtime that is not commercials would be the remainder when you subtract one eighth from the whole. Since the whole is represented by the fraction 1 (or 8/8), we subtract the commercial fraction from it:
1 - 1/8 = 8/8 - 1/8 = 7/8
So, 7/8 of radio airtime is not commercials. Now, to find out what percentage of the radio airtime is commercials:
We know that the fraction for commercials is 1/8. To convert this to a percentage, we multiply by 100:
(1/8) × 100 = 12.5%
Therefore, 12.5% of radio airtime is made up of commercials.