The first slice of pizza yields Jeffrey 42 units of utility and the second slice yields him an additional 28 units of utility. His total utility from three slices of pizza is 90 units of utility. The marginal utility of the third slice of pizza is units of utility.

The answer is 20units.

Explanation:

Marginal utility is the additional satisfaction or benefit that a consumer gets from consuming another unit of a good or service.

The first slice yields 42units

The second yields 28 units.

The third is unknown yet but his total utility is 90units of utility.

To find the third now is:

90 - (42 + 28)

90 -70

=20 units of utility

Therefore the third slice of pizza will give him 20 units of utility

answer; synthetic production system;