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Answers to the fourth edition of the first volume of advanced mathematics
If the price is set at 5-0.02x, it can be sold at 200+20x (0 =

(5-0.02x) (200+20x)-4 (200+20x) =-0.4x squared+16x+200.

X=20 has a maximum value, so if you buy 600 pieces at the price of each piece, 4.6 yuan will gain the most.