In Reply to: Jon posted by dennisccc on Sunday, 15. August 2010 at 22:34 Bali Time:
The visa fee of US$25 is converted to Rp. The A$ is worked out using this Rp value. For example Rp230 000. This Rp value is then converted to A$ to see how much is payable in A$. Exactly the same as when you change A$ into Rp. They are still buying A$ with Rp. They use the airport rate which of course is lower than the street or bank rate.
The bit about 2 conversions is correct, but your reasoning is all wrong.