Bounty creators are charged for exactly the amount they posted in the bounty. Decimals places are ignored.
But please note your credit card company may charge additional fees. To avoid a credit card conversion fee, you can post bounties in your card's native currency. In the case of multiple cards we will charge the card that matches the bounty currency.
*A currency conversion fee may happen if the currency of the bounty is not the same as the currency of one of the bounty earner's bank accounts.