4000 million.
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4000
There are 4 billion/10 million = 400 of them.
40 million
4 billion/10 million = 4 x 109 / 10 x 106 = 4 x 109 / 107 = 4 x 102 = 400
4,000,000,000 multiplied by 3 is equal to 12,000,000,000 (4 billion x 3 = 12 billion)