Master Chen moved 250 boxes of glass instruments, and stipulated that the shipping fee for each item was 30 yuan. If there was any damage, the damaged box would not only not be charged the shipping fee, but would also be compensated for the loss of 150 yuan per box. Then, if Master Chen wants to get the shipping fee, the number of damaged instruments should not exceed how many boxes.
陈师傅搬运玻璃仪器250箱，规定每项运费30元，若有损坏，被损坏的箱不仅不给运费，还要每箱赔偿损失费150元．那么，陈师傅要想得到运费，损坏的仪器不能超过多少箱．
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