Solve the following LP problem graphically using level curves. 
Definitions:
Purchase Order
A document issued by a buyer to a seller, indicating the types, quantities, and agreed prices for products or services.
Vendor
A business or person that sells goods or services.
Bank Reconciliation
The process of comparing and matching figures from the accounting records against those presented on a bank statement to ensure they match and are correct.
Check Amount
The sum of money written on a check that the drawee is directed to pay.
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