Sunnydale Farm comprises 240 acres of cropland. Farm owner wants to plant the acreage in corn and oats. Profit per acre in corn production is $40 and in oats is $30. The total of 320 hr of lavor is available. Every acre of corn needs 2 hrs of labor, while each acre of oats needs 1hr of labor. How must land be divided between corn and oats to yield maximum profit?