Answer:
There is no short answer.
Step-by-step explanation:
The total energy that the flowers contain is 100.000 units and this gets transferred to the butterflies once they eat the flowers. The butterflies are then eaten by the birds who take on the remaining amount of energy.
The amount of energy that is transferred to the birds should be 100.000 units minus the total energy that was spent by the flowers and butterflies during the time until they were consumed by the next link in the chain.
I hope this answer helps.