The ratio of the weight of a bunch of bananas to the weight of them once they are peeled is
1 : 0.618
This is the divine ratio or golden mean found in sacred geometry. So, is this proof that bananas are a gift directly from the gods?! :-O
Mundanely, if you want to weight your bananas with peel on (and keep your scales clean) then multiply the weight by 0.618 to get the net weight to put in CRON-o-meter.
I'm going to have to try that out! Good to know, thanks. :)