Talk:Ferrari F12berlinetta Championship/@comment-29636239-20180501100607/@comment-26829117-20180501123350

It isn't a mistake, it's a feature of the game. It appears that PR upgrades contain a second decimal place that isn't displayed and create rounding errors. Whilst the delta can change depending on what order you apply upgrades, the PR of any set of upgrades is always the same (i.e. deterministic).

I've tried many times to find a way to calculate the second decimal place and whilst I think it is possible, I've never managed it. What we really need is Rachel Riley to show us how to do it.