The first pepsi yields craig 18 units of utility and the second yields him an additional 12 units of utility. his total utility from three pepsis is 38 units of utility. the marginal utility of the third pepsi

8 units

Explanation:

The marginal utility deals with the additional satisfaction derived from consuming additional units

In the given case, the first yield has 18 units of utility, the second yield has additional 12 units of utility and the total utility is 38 units, so the marginal utility of the third Pepsi would be

= Total utility - first utility - second utility

= 38 units - 18 units - 12 units

= 38 units - 30 units

= 8 units

The first Pepsi yields Craig 18 units of utility and the second yields him an additional 12 units of utility. His total utility from three Pepsis is 38 units of utility. The marginal utility of the third Pepsi is 13

Explanation:

marginal utility = change in total utility/ change in no of goods

at first goods    utility=18 units      while the marginal utility is 18

at second goods  utility= 25 units     while the marginal utility is 12

at third goods       utility= 38 units      while the marginal utility is 13