As a result you will get two new nodes. Press the “Option”-key on the keyboard and click on the first one to activate its title field. Type “Production cost”. While the title field is still activated, press the “Tab”-key. This will deactivate the title field of the “Production cost” node and activate the title field of the next node. Name this node “Selling price”, and press the “Enter”-key. Finally arrange the nodes as shown in the Figure.
