设售出时涨价x元,则售价是(50+x)元
最终可卖出(500-10x)个,设利润是y
y=(50+x)(500-10x)-40×(500-10x)
y=(10+x)(500-10x)=5000+400x-10x²
y=-10(x²-40x-500)
y=-10(x-20)²+9000
设售出时涨价x元,则售价是(50+x)元
最终可卖出(500-10x)个,设利润是y
y=(50+x)(500-10x)-40×(500-10x)
y=(10+x)(500-10x)=5000+400x-10x²
y=-10(x²-40x-500)
y=-10(x-20)²+9000