Issue with multiple subqueries - sql

Question

I need to do a subquery within a subquery. For example, on a given day (3-July-14) we have 2 services done (see below). Each of these services has three costs, a basic, additional labour and additional parts charge. These three added up become our OverallCharge. We then need to determine the min, max and avg of these overall charges.
I know how find out the OverallCharge and minimum, maximum and average overallcharge required.
SELECT MIN(OverallCharge) AS MinOverallCharge, MAX(OverallCharge) AS MaxOverallCharge, AVG(OverallCharge) AS AverageOverallCharge
FROM (SELECT ServiceId, Sum([S.BasicCharges]+[S.AdditionalLabourCharges]+[S.AdditionalPartCharges]) AS OverallCharge
FROM Service AS S
GROUP BY ServiceId) ;
The next part is finding out the services per service day, which I have done successfully,
SELECT Service.ServiceDate, Count (Service.ServiceId) AS NumServices
FROM Service
GROUP BY ServiceDate;
I now need to combine the two (somehow) and find out the amount of services done, the minimum and maximum overall charge as well as the average and group by service date and not service ID. (I.E. fin on any given day, what the minimum and maximum overall charge of a service was and what was the average overallcharge that day). It should appear in columns of, date, services done, min, max and avg overallcharges. Any help would be greatly appreciated