stake is percentage of total coin in a campaign.
if a bounty has 100 coins and if total stake is 100 then 1stake = 1 coin. other wise you need to calculate.
Thanks for your response. And this coins will be paid to the ethereum addresses as tokens, right ?
It depends on the developer If the developer is using another asset such as waves, or nxt asset and you will be using waves or nxt address to receive your asset. I think that already explained by the bounty manager or thread.