Baking a tray of corn muffins takes 8 cups of milk and 5 cups of wheat flour .Baking a tray of muffins takes 4 cups of milk and 5 cups of wheat flour.A baker has 40 cups of milk and 35 cups of wheat flour.He makes $7 profit per tray of corn muffins and $5 profit per tray of bran muffins