In Reply to: VOA posted by morebintang on Wednesday, 2. May 2012 at 07:59 Bali Time:
I would confidently hand over the AUD75.
Have another $10 in your pocket just in case on the day and for whatever reason the AUD75 is not enough.
Alternatively of course, you could just hand over the AUD100 and take whatever change is deemed to be appropriate in Rupiah, and use this for taxi etc.