Simplify the expression. 
Definitions:
Total Utility
Measures the total satisfaction or benefit that a person derives from consuming a certain quantity of a good or service.
Utility Schedule
A table showing the different levels of utility or satisfaction derived from consuming varying amounts of a good or service.
Marginal Utility
The boost in satisfaction or usefulness one gets from consuming an extra unit of any good or service.
Total Utility
The total satisfaction or benefit that a consumer derives from consuming a certain quantity of goods or services.
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