Find the derivative of the function. 
Definitions:
Cost Of Discounts
The reduction in revenue a company faces when it offers products or services at a reduced price.
Receivables Balance
The total amount of money owed to a company by its customers for goods or services delivered, but not yet paid for.
Average Collection Period
The average number of days it takes for a business to receive payments owed by its customers.
Average Daily Sales
The average amount of sales generated per day over a specific period, commonly used to assess business performance.
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