Find the differential of the function. 
Definitions:
Hard Candies
Sweet confections made by boiling sugar syrup to a high temperature and then cooling it to form solid candies.
Pocket Money
A small amount of money given to children by their parents as an allowance.
Maximum Utility
The highest level of satisfaction or fulfillment obtainable by an individual or society from their economic activities.
Hard Candies
Sweet confections that are solid and brittle, made primarily from sugar with various flavorings and colorings.
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