Answer: There is 211 number of acres of barley the farmer can plant and still be under budget.
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Explanation:
Since we have given that
Amount of budget = $18000
Expenses he spent to plant wheat = $8100
So, Total amount for acre is given by

Cost of each acre to plant = $47.00
So, the maximum number of acres of barley is given by

Hence, there is 211 number of acres of barley the farmer can plant and still be under budget.