To calculate the area of your spaces:
From the drop-down menu in column Room1 select the kind of the room, for example Storage, Parking...
In column M1 select the area (in area units) you wish for this room. In column Cost1 select the cost for each area unit. In column "Total1" is displayed the cost of room1.
Go on, select and complete the fields for the rest rooms. If you do not want to include any of the rooms, in the "Display Room" column, select "no". In the field "Total Area" the total area is displayed, and in "Total Cost" the total cost.
If you wish, you can change the data by entering new one. To delete the data and return the table to its original form, do a reset or refresh.