Summing Rows Into A Column

Hello, This is my first post so please be kind. I have been attempting to convert a query I built in MS Access for use in MSSQL 2000, the syntax for these is different so I was frustrated to find out I could not use the access query.

I have 4 columns one containing a user Id and the others costs, I wish to total the costs per user ID at the end of each row.

So far I have managed to convert about half of my access query, this gives mev the clientID's and costs in columns but I cannot for the life of me get the costs in a total. It's annoying because my access query works perfectly.

This is my Access query:
SELECT DISTINCT Holiday_Bookings.ClientID, Holiday_Bookings.Booking_Cost, Room_Facilities.FacilityCost, Rooms.CostPerNight,
Rooms!CostPerNight*Nights_Stayed+Holiday_Bookings!Booking_Cost+Room_Facilities!FacilityCost AS TotalCost,
[TotalCost]*17.5/100+[TotalCost] AS [Total+VAT]
FROM Room_Facilities INNER JOIN (Hotels INNER JOIN (Holiday_Bookings RIGHT JOIN Rooms ON Holiday_Bookings.ClientID = Rooms.ClientID) ON Hotels.HotelID = Rooms.HotelID) ON Room_Facilities.FacilityID = Rooms.FacilityID;

And this is what I have been able to salvage into MSSQL format:

SELECT
Holiday_Bookings.ClientID,
Holiday_Bookings.Booking_Cost,
Rooms.CostPerNight,
Room_Facilities.FacilityCost
FROM
Rooms
INNER JOIN Room_Facilities ON (Rooms.FacilityID = Room_Facilities.FacilityID)
INNER JOIN Holiday_Bookings ON (Rooms.Clients_ID = Holiday_Bookings.ClientID)

How can I total the three columns and add the tax?