the price of producing one additional unit of a good
Step-by-step explanation:
The marginal cost refers to the expense of producing one more unit of a product an it includes all the costs the company may have to be able to increase the level of production. According to this, the best definition of marginal cost is the price of producing one additional unit of a good.
The other options are not right because they talk about an income or gain.
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Just to let you know just in case if you have the same question is that the formula of finding the surface area of a rectangular prism is A = 2(wl + hl + hw)