Non-cumulative sequential bonuses

If an affiliate reaches 10 orders, they receive bonus 1 worth an additional €100. If the same affiliate reaches 20 orders within the same month, they receive bonus 2 of €150. At the end of the month, they do not earn €250, only the €150 from the last bonus/goal achieved. In other words, the bonuses are not cumulative; only the last level reached counts.