Answer:
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
