RE: Pillock.3 Jan 2022 13:50
b-b: "if I am told the sp changed 0%, I have the start price, 142 plus the change, 142x0=0, giving me and end price of 142."
Your own method of calculation gives you an end price of zero ... as you've proved to yourself, and not 142.
b-b: "You must be quite illiterate ... you are in fact showing a staggering degree of ignorance in maths and especially percentages. "
I find it laughable that someone is trying to pit their pitiful grasp of basic numeracy against my mathematics background. Suspect you're unemployed (or unemployable) given the time you spend being wrong on here.