商店出售某种商品,进价每件180元,按每件200元出售,可出售50件,为薄利多销每降低1元出售,销量就增加5件。问每件降价多少元出售盈利最多?
2023-06-09
A.7
B.4
C.5
D.6
参考答案:C
B.4
C.5
D.6
参考答案:C
设每件降价x元出售,则每件应盈利(200-180-x)元,因此可得盈利为(50+5x)×(200-180x)=1000+50x-5x2=1125-5×(x-5)2,故当x=5时,盈利最多为1125 元。
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