Find the differential of the function. 
Definitions:
Federal Income Tax
The charge imposed by the IRS on the yearly income of individuals, corporations, trusts, and various legal bodies.
Discounted Note
A promissory note sold for less than its face value that will be worth its full value upon maturity.
Interest Calculations
The process of determining the interest amount payable or receivable over a certain period based on the principal sum and the rate of interest.
Journalize
The process of recording financial transactions in a company's journal before posting them to the general ledger.
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