Dividing by 400,000,000 is like trying to find a needle in a haystack. The answer is simply the number you're dividing by, in this case, 1. So, congratulations, you've successfully divided by 400,000,000 and ended up with 1. Now go celebrate your mathematical prowess!
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20000000 x 20 = 400000000
20,000
That's 1 out of 2500 - or 0.04%
It is 4.0*10^8 in scientific notation
6,403,096,728