Find the limit. 
Definitions:
Gross Investment
The total amount of money spent on capital goods, or assets that will provide productive capacity for the future, without deducting for depreciation.
Depreciation
The process of allocating the cost of a tangible asset over its useful life, reflecting the decrease in value over time.
Capital Stock
The total value of all physical assets owned by a company that are used in producing goods and services.
Interest Rate
The percentage charged or paid for the use of money, typically expressed as an annual rate on loans or earned on deposits.
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