(2) A wheat farmer is converting to corn because she believes that corn is a more lucrative crop. It is not feasible for her to convert all her acreage to corn at once. She is farming 600 acres of corn in the current year and is increasing that number by 40 acres per year. As she becomes more experienced in growing corn, her output increases. She currently harvests 120 bushels of corn per acre, but the yield is increasing by 6 bushels per acre per year. When both the increasing acreage and the increasing yield are considered, how rapidly is the total number of bushels of corn increasing per year? Hint: use the product rule