Suppose the seventh carrot you consume provides a marginal utility of 3 utils and the eighth carrot provides a marginal utility of 2 utils. If you consume the eighth carrot your total utility will

the  total utility in the case when you consume eight carrots is 5 utils

Explanation:

The computation of the total utility in the case when you consume eight carrots is shown below:

= Marginal utility when seventh carrot is consumed + marginal utility when eight carrot is consumed

= 3 utils + 2 utils

= 5 utils

Hence, the  total utility in the case when you consume eight carrots is 5 utils

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