Evaluate the limit. 
Definitions:
Marginal Utility
The change in total utility a consumer experiences from consuming one additional unit of a good or service.
Total Utility
The complete pleasure derived from the consumption of a specific amount of products or services.
Consumption
The utilization of products and services by families.
Marginal Utility
The change in total utility a person receives from consuming one additional unit of a good or service.
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