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let the number of boxes sell be d(x), then e have
d(x) = c0 -12x
200 = c0 - 12*19
c0 = 448
d(x) = 448-12*x
the profit p(x)
p(x) = d(x) (x-3) = (448-12x)(x-3) = (484x-12x^2-1344)
let dp/dx = 484-24x = 0
x = 20.17 = 20
the selling price is $20
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