How is the ratio between real money and bonus money calculated?

The balance of the bonus money and the real money are used proportionally for bets and winnings.
For example, if you have €100 in real money and €50 in bonus money in your account, the ratio is.

In the following example, if you place a bet of €30, your bet will consist of €20 of real money and €10 of bonus money. Your winnings will be paid out using the same ratio.