Shanshan Children's Wear Factory plans to produce 2,500 sets of children's wear in April. It has been in production for 15 days, with an average of 84 sets per day. How many sets must be produced in the second half of the month to overfulfill the task?
杉杉童装厂计划四月份生产童装2500套，已经生产了15天，平均每天生产84套．要想超额完成任务，后半月至少要生产多少套？
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