There is no way of knowing exactly how much you will win before the results are in, as it will depend on what the winning numbers are and what the dividend pays - both of which are unknown before the race has finished.
All tote-based exotic bets will be paid on the National Tote dividend declared by TAB.
For example, if the trifecta in the bet below pays $150, the win price will be calculated like this: $150 x 166.66% = $249.99