It doesn't need 5 pages of maths.
I do think such basic errors really need to be flagged up though.
These are the kind of basic 'mistakes' BASSA are making, and they are asking our crew to put their jobs, and their family income on the line.
(I say 'mistakes' as BASSA have good form on deliberately peddling vague half truths and misleading spins. They also don't step in to correct errors on their own forums they know will help rile up the crew. The pilots free black tie ball that never was free or black tie, just a few mates in a pub, and the half truths about our productivity deal for starters)