One acre land of maize must give you at least 15 bags (50kg) per bag. I am a maize farmer, and I sell one bag for a 1000cedis. It's more than 5000 cefid
Good thing is, the OFA product can fight over 20 crop diseases including Fall Army Worm. So you don't need to spend extra money on disease control. The cost of harvesting in part of Miscellaneous cost of ¢200.