In reality, you're right, the number of people might not be a nice number like 100. The percents might not be nice whole numbers like 60% either. However, the logic would be the same. This is because our answer is a percentage, so we don't care about the number of actual people, but only about their proportions. For example, if you eat half of a pizza and want to know what fraction is left, you don't care how big the pizza is. The answer is half.
I hope this helps!
The Daily Challenge Team