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You forgot the SUM aggregate:
SELECT tblServiceLocation.Description, tblService.Description, SUM(tblVehicleService.Price),
tblVehicleService.ID, tblService.ID
FROM
tblVehicleService, tblServiceLocation, tblService
WHERE tblVehicleService.ServiceLocationID = tblServiceLocation.ID
AND tblVehicleService.ServiceID = tblService.ID
GROUP BY tblServiceLocation.Description, tblService.Description, tblVehicleService.ID, tblService.ID
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