Concept:Profit is the difference between total selling revenue and total cost.Explanation:Total cost =9×80,000.00=720,000.00.Total selling revenue =9×90,000.00=810,000.00.Profit =810,000.00−720,000.00=90,000.00.Thus, the farmer makes a profit of D90,000.00.Answer:C. D90,000.00