Sum of two items in a database table

If I have two columns in a table like this:

Options | Deck Cost | Window Cost |
Option 1 | $5000 | $ 4000 |
Option2 | $3000 | $2000 |

How do I display the sum of the Deck Cost and Window Cost for an option if I connect the data to my page? ( I would like to have a text element on my Page that says estimated total cost: )

Thanks in advance for any help!