y= 200(x-8),0
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y= 200(x-8),0
y= 200(x-8),0
y= 200(x-8),0
主要问题在x>40的时候
当x>40,则,因为没加1元少4间,所以出租房间数为200-4(x-40),而每间房利润x-8
所以,总利润为(x-8)*[200-4(x-40)]=(x-8)(360-4x)=4(x-8)(90-x)
设提高了x元,那房间就租出200-4x间,每间利润是40+x-8,方程式为y=(200-4x)(20+x-8),0
每间定价高出1元,则会少出租4间,
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