As a number it is: 3,090,000,000 = 3.09 billion
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6.8 billion minus 309 million = 6,491,000,000
3.2 billion is written as 3,200,000,000.
ANSWER: 61.820% of 309= 20% * 309= 0.20 * 309= 61.8
It is: 1,400,000,000 = 1.4 billion
28.5 billion is written 28,500,000,000.