Many years ago, I read a book by John Allen Paulos, an American teacher of mathematics. Paulos recounted some examples from a test he conducted for potential employees of an organisation he was consulting for. One of the questions was that if a quantity grows from 50 to 100, has it increased by 50%, 100%, or 200%?
The answers that the candidates gave were all over the place, indicating that many of them were just guessing. It’s notable that getting the answer correct requires no great ..