Find the exact value of the given expression. 
Definitions:
Oil Reserve
Stocks of crude oil or refined petroleum products held underground or in storage facilities controlled by countries or corporations for future use.
Profit
The financial gain realized when revenue from business activities exceeds the costs and expenses involved in operating.
Market Rate
The prevailing price or cost of goods, services, wages, or interest rates in the open market.
Natural Gas
A fossil fuel composed mainly of methane, used as an energy source for heating, electricity, and vehicle fuel.
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