Find a power series representation for the function and determine the radius of convergence. 
Definitions:
Interest Rate
The percentage charged by a lender to a borrower for the use of assets, typically expressed as an annual percentage of the principal.
Normal Return
The minimum profit necessary to keep a company in business, regarded as the cost of capital in the long run.
Investment
The allocation of resources, usually money, in order to earn a future return or profit.
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