Luffy 6 billion and that's it.
Luffis bounty for Kaido will be Luffy's last bounty because after this arc, there will be a final war with the Government. And there will be no one else to give Luffy's bounty, and his bounty at the end of the manga should be higher than Roger's. It's 6 billion.
Law and Kid are not even worthy of 1.5 billion, what 2?) If the island was not in the air, then BM, even without Haki, would have defeated them after their last attacks. What is the sum of 4 by 2?