Solve the following LP problem graphically using level curves. 
Definitions:
Joint-Stock Companies
Businesses owned by shareholders who invest money and share in the profits and losses, allowing for larger capital and risk distribution.
Liability
The state of being responsible for something, especially in terms of legal or financial obligations.
Investment in Trade
The allocation of resources, including money, into the buying and selling of goods and services between countries with the aim of generating profits.
Order or Estate
Historical classifications of society, especially in pre-modern Europe, divided into broad groups such as the clergy, the nobility, and common people.
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