Explanation:
The answer to the problem is as follows:
For a box with x chocolates, the cost of packaging is C(x) = x^2 and the
weight is W(x) = x + 2.
Thus the cost per unit weight is C(x) / W(x) = x^2 / (x + 2).
I hope my answer has come to your help. God bless and have a nice day ahead!