1/10 x 1000000000 = 100000000
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one-hunderd-billion
One hundred million
0.4 billion is four tenths of one billion. One tenth of a billion is 100 million. (A billion is one thousand millions.) So four tenths of a billion is 400 million, or 400,000,000.
3 million dollars
27,578,684,000 rounded to the nearest tenth of a billion is 27,600,000,000