You can write 1 billion Australian dollars like this 1,000,000,000 AUD. You can also save 1 x 10^9 A$ or AU$.
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1,000,000,000 $
1,ooo,ooo,ooo
1,250,000,000 1 250 000 000
It is: 40,000,000 dollars
2% of 1 billion = 1 billion * 2/100 = 20 million dollars.