Calculating weighted Average From DB - sql

Question

Hi every one.
I have a DB shown in the following picture.
enter image description here
Every season, every personnel could have one or more posts and every post is in a specific unit. My question is how to calculate weighted AVG for every personnel in each related posts (note that we have two types of criteria where ct.ID = 1 OR 2). I did something as below
select r.EvaluaTEDID,r.PostID, Avg(r.FirstScore*iif(ct.id=1,p.COMCrtWeight/100,0))+
Avg(r.FirstScore*iif(ct.id=2,p.PROCrtWeight/100,0)) as 'AVG'
from results r
inner join post p on r.PostID = p.ID
inner join job j on p.JobID = j.ID
inner join subcrt sc on r.SubCrtID = sc.ID
inner join Crt c on sc.CrtID = c.ID
inner join CrtType ct on c.CrtTypeID = ct.ID
where r.SeasonID = 4 and j.UnitID = 3068
group by r.EvaluaTEDID, r.PostID
but MSSQLS showed 46 which is the weighted average of all records for personnel with ID=8. The desired answer should be 87 (36+51)
COMCrtWeight=40,PROCrtWeight=60
ct.ID for SubCID=6 is 2 and ct.ID for SubCID=1 & 4 is 1
seasonID - EvaluaTEDID - SubCID - PostID - Score
4 ------------ 8 ------------------ 6 ----------- 26 ------ 90
4 ------------ 8 ------------------ 1 ----------- 26 ------ 90
4 ------------ 8 ------------------ 4 ----------- 26 ------ 90
I also did something like this:
select EvaluaTEDID, sum(WeightedSum) from
(select r.EvaluaTEDID,r.PostID,
avg(r.FirstScore*iif(ct.id=1,p.COMCrtWeight/100,p.PROCrtWeight/100))
as WeightedSum from results r
inner join post p on r.PostID = p.ID
inner join job j on p.JobID = j.ID
inner join subcrt sc on r.SubCrtID = sc.ID
inner join Crt c on sc.CrtID = c.ID
inner join CrtType ct on c.CrtTypeID = ct.ID
where r.SeasonID = 4 and j.UnitID = 3068
group by ct.id, r.EvaluaTEDID, r.PostID)
group by EvaluaTEDID
Buy I got syntax error.
Could you please help.
Thanks in advance.