tip property in bill.go does not update

[SamuelAl]

Hello,
For some reason the tip property in bill.go does not update when bill.updateTip is called from promptOptions. I have even copy-pasted your code and still no update. Any idea why this would happen?
Thank you so much for all the videos you are doing.

[nemwark]

the update tip signature should be
func (b *bill) updateTip(tip float64)
not
func (b bill) updateTip(tip float64)