Just like their male counterparts, many Australian women earn money 2,000 dollars per month.
If a ‘unit’ can correspond to more than one different noun, then you need to specify your noun:
In this example, kg could apply to many other nouns: potatoes, chocolate, etc, and so it is necessary to be specific about ‘rice’.
On the other hand if the unit can only correspond to a single noun – unambiguously – then there’s no need to mention that noun:
In this example, ‘dollars’ clearly corresponds to ‘money’, and so it is redundant to say “1,000 dollars of money”.
If we apply this to the original problem then we get: