The figures used are an average of all school pupils, not just primary.
As I have said three times now, if you would like to improve on the figure, feel free.
I do wonder why the sudden interest in accuracy though, given you were plucking a figure upwards of £5million from thin air a few short posts ago.
In any case, it makes no difference to anything because it's entirely hypothetical.
Perhaps get back to discussing government handouts for education, or essential investment for the good of the island as you interchangeably like to call them depending on the income bracket to which they apply.