Answer:
The conversion factor to use here is ($1 US dollar) / (1.2 Austr. dollars), and the
final result is 22 Austr. dollars = US$18.33.
Explanation:
The relevant conversion factor here is
1 US dollar
-----------------------
1.2 Aust. dollars
Then:
22 Aust. dollars 1 US dollar
------------------------ * ------------------------- = 18.33 US
1 1.2 Austr. dollars