3.88 billion is another way of saying 3.88 x 1 billion. Thus, (3.88)(1000000000) = 3880000000.
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17.9 billion written out in numbers is 17,900,000,000
1,000 billion billion is: 1,000,000,000,000,000,000,000
153.4 billion = 153,400,000,000
4.2 billion = 4,200,000,000
It is: 900,000,000 = 0.9 billion