i want give an example as well:
Luffy 1 billion [1. 30 million * 10 => 300 million ; 2. 100 million * 10 => 1 billion]
zoro 240 million [60 million * 2 => 120 million * 2 => 240 million]
sanji 111 million
robin 81 million [79 million + 1 million => 80 million + 1 million => 81 million]
franky 88 million
brook 66 million
usopp 100 million [like Luffy's Bpunty]
nami 33 million
well this is like a load of sh** but since luffy destroys the WG on his own this time, i think his bounty will be a lot bigger than of his crew. not sure about the explanation of bounties but it seems like oda is using some math:D