Sally crops

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Sally has a 320 acre farm where she plants two crops: green beans and potatoes. Every acre of green beans planted costs her $50, and every acre of potatoes planted costs her $100. 100 bushels of storage are required for each acre of green beans and yields a profit of $60; 40 bushels of storage are required for each acre of potatoes and yields a profit of $90. If the total amount of storage space available is 19,200 bushels and the farmer has $20,000 on hand, determine how much of each crop Sally should plant in order to maximize her profit? What will be the maximum profit?
The profit equation is P = 60x + 90y, where P represents profit. The 60x means a
Is the total number of acres no more than 320?
Is the total amount of storage needed no more than 19,200 bushes?
Is the cost no more than $20,000?