Show that the function 
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.
Definitions:
Interest Rate
The share of a loan subjected to interest charges for the borrower, often expressed as an annual percentage of the total loan that is yet to be paid.
Annual Payment
A payment made once a year, often in the context of loans, leases, or insurance policies.
Investment
The allocation of resources, usually money, in order to generate income or profit.
Present Value
The calculated value in current terms of an expected future cash flow or sum of money, discounting at a given rate of return.
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