Yes... and having a naive looking, freckled face kid asking me these questions of why certain numbers don't add up (as they should be according to his uni texbooks, but NOT always in the real world!) gives me the temptation to respond like the above cartoon.
But it seemed like yesterday, when I was in his shoes. So, I try to help out as much as I can. A bit time consuming, but things are starting to settle down. Which is why I have time to write this post.