Sub Queries

I have a little SQL puzzle I am trying to work out..
This is an a/r question...
I have various transactions with date,amount, group, and userid,
(amongst others)

I need to get a query that will return totals as single rows in the
following format

Users | AR current | AR over 30 | AR over 60 | AR over 90 | Total AR

It will be returned grouped by group

User is count( DISTINCT userid)
AR_current is a total of all amounts in the rows whose dates are in this
month..
AR_over 30 is with dates in the preceding month
etc..
And AR_total is the total of all amounts in all the rows of the table.
I am trying to use several subqueries each returning a sum of the
applicable balances

I cannot seem to get it to work.. Any other suggestions on how to handle
this issue?

Table has rows like
userid -- from which I can also get the group
dateposted
amount

Looking for rows returned as
groupa,  number of users with records in this table in this group,
dollar figure who's transactions are in a certain date range(1), dollars
in date range (2), in date range (3), total of all transactions in that
group.
groupb, etc..
groupc, etc..

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