ACCESS - Easy QUERY (Help)

HI,

I have the next 3 tables,

*************************************************
Table USER: id_user (primary key)
name

Rec: id_user, name
------------------
rec: 1, A
rec: 2, B
rec: 3, C

*************************************************
Table AP : id_ap (primary key)
nr_ap (primary key)
id_user
id_sort

Rec: id_ap, nr_ap, id_user, id_sort
-------------------------------------
rec: 1, 2, 1, 1
rec: 2, 5, 2, 1
rec: 3, 1, 3, 1
rec: 4, 3, 1, 2
rec: 5, 4, 2, 2
rec: 6, 3, 3, 2

NOTE:
SELECT sum(nr_ap) AS Total FROM AP

with id_sort = 1 -> SUM(nr_ap) = 2+5+1 = 8
with id_sort = 2 -> SUM(nr_ap) = 3+4+3 = 10
*************************************************
Table SORT: id_sort (primary key)
value

Rec: id_sort, value
------------------
rec: 1, 80
rec: 2, 200

**********************************************
I need do create a QUERY that for all records in SORT table, it will
show only for user 'A', the rescords as in the result shown below.

NOTE: xxxx = (valueSUM(nr_ap))*nr_ap

RESULT EXPECTED
------------------
id_sort, name, ap, value, xxxx

1 A 2 80 20 (808)*2 = 20
2 A 3 200 60 (20010)*3 = 60


Regards,
Elio