0.6857
473,488,000,000 divided by 12 is 39,457,333,333.33... (repeating forever)
12 * 200 million = 2400 million = 2.4 billion.
30 million is 12/3% of 1.8 billion
12 billion is 12,000 million, in the US and present UK Short Scale. 12 billion is 12,000,000 million, in the former UK Long Scale.
in Europe, a billion is a million million = 10^12 (one with 12 zeros). in the U.S. a billion is a thousand million = 10^9 (one with 9 zeros).