填空题 Room prices are regularly ＄100, but for each additional room rented by a group, the price is reduced by ＄3 for each room. For example, 1 room costs ＄100,2 rooms cost 2×＄97=＄194, 3 rooms cost 3×＄94=＄282, and so on. What is the total cost of renting 6 rooms?
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【正确答案】 1、＄510    
【答案解析】由题干中的例子类推可知租六间房子的房租为6×[100-3×(6-1)]=510。