Re: 30% increase is far less than the fall in the pound.
Yes, that reminds me of a teacher I had long ago. I think the topic was called "business mathematics" then. His main occupation was with the stock exchange, why he bothered with us I do not know. Anyway, he told us he had this dream of some day being invited to the "parliament" to teach them how to deal with this magic % sign. According to him the country would do x % better then. I am inclined to believe he had a point there.