Q: Is it true, around 8 in 10 people, of the general population, don't understand how percentages work?
A: Yes, so around 175% of the general population don't understand percentages.
Q: Is it true that you have to understand mathematics, to become an electronics or software engineer?
A: Yes. That is why there are three types of people in this world, those that can count (and may become engineers), and those that can't count.