Solution: After storage for x days, the price is 0.5x+ 10, the damage amount is 6x, and the cost is 340x.

So y = (0.5x+10) (2000-6x)-340x (0 ≦ x ≦1/0).

y=-3x？ +600 x+20000(0≤x≤ 1 10)

Sorry, I was helping a senior three student solve a big problem just now, and I haven't had time to help you solve it until now. . .