f maria gets 80 utils consuming five cookies 100 utils consuming six cookies and 120 utils c

f Maria gets 80 utils from consuming five cookies, 100 utils from consuming six cookies and 120 utils from consuming seven cookies, then Mariaʹs marginal utility from the sixth cookie is: 25) ______

A) 100 utils. B) 80 utils. C) 40 utils. D) 20 utils. 

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