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Kneel down! ! ! A math problem with high IQ! ! ! ! ! ! ! ! ! ! ! !
If the price of each piece is reduced by X yuan, the profit of each piece is (40-X) yuan, and (20+2x) pieces can be sold every day. According to the meaning of the question, inequalities can be listed.

(40-x)(20+2x)>= 1200

When 10

When x= 15, the maximum profit 1250 yuan can be obtained.

When x= 10, the daily profit 1200 yuan can be obtained with the least labor.

When x=30, the inventory can be reduced as quickly as possible, and the daily profit is 1200 yuan.

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