题目内容
The fastest time in which a batch of 20 'spicy meat special' sandwiches has been made was 32 mintues, with no hold-ups. However, work studies have shown that, on average, about 8% of the sandwich makers' time is non-productive and that, in addition to this, setup time(getting ingredients together etc), is 2 minutes. If the sandwich-makers are paid $4.5 per hour, what is the attainable standard labour cost of one sandwich?
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