The total utility from consuming eight units given the marginal utility and total utility of the ninth unit must be 112.
Marginal utility is the additional utility derived from consuming one more unit of a good. Total utility is the total satisfaction that is derived from the consumption of a good or service.
Total utility of consuming the 8th unit = total utility of consuming the ninth unit - marginal utility of the ninth unit
115 - 3 = 112
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