We don't know how we are to recompense you for the trouble you have taken.

We don't know how we are to recompense you for the trouble you have taken. Correct Answer reward

Reward : a thing given in recognition of service, effort, or achievement.
Help : make it easier or possible for (someone) to do something by offering them one's services or resources.
Praise : express warm approval or admiration of.
Thank : express gratitude to (someone), especially by saying ‘Thank you’.
Recompense : pay or reward (someone) for effort or work.

Synonym of Recompense is Reward

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