Answer:
C-about 84%
Explanation:
We are given that,
Total number of population, n = 25
Number of people who prefer to read a digital copy = 4
Number of people who prefer to read a hard copy = 21
It is required to find out the percent of population who prefer to read hard copy.
So, we have,
Percent of population preferring hard copy =

i.e. Percent of population preferring hard copy =

i.e. Percent of population preferring hard copy = 0.84 × 100 = 84%
Thus, the percent of population who prefers to read a hard copy are about 84%.