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Quest experience points are generated using a small equation. Why this is done I am not sure as the values always seem static.
(base * paramgrow * (45 + 5 * level)) / 100;
The base value can be found in the quest itself, offset: reward_exp_bonus [https://github.com/viion/XIV-Datamining/blob/master/exd-xivdb-offsets/Quest/quest_csv_xivdb.txt](found here)
The paramgrow value is found in the ParamGrow file! offset: exp_mod [https://github.com/viion/XIV-Datamining/blob/master/exd-xivdb-offsets/ParamGrow/param_grow_csv_xivdb.txt](found here)
The level is the level of the quest, offset class_level_1 (main class) [https://github.com/viion/XIV-Datamining/blob/master/exd-xivdb-offsets/Quest/quest_csv_xivdb.txt#L10](found here)
If a quest is a bove 50, it has an additional 10k exp per 100th base value.
So after the question, you would do:
exp + (base / 100) * 10000;
Not fully confirmed this, but it has worked for a few 50+ quests I tested against.