Query to aggregate contract line-item values across contracts - sql

Question

I have 2 tables in Microsoft Access: Contract_1 & Contract Items
Contract_1 has columns like: Contract ID, Contract Value, Date, Committed Prod_ID, an example of their values will be:
1 $100,000 3/5/15 111
Contract Items has Prod ID, Product, Unit Price an example of their values will be:
111 Light Bulb $5.00
They are linked by a One to Many relationship, Prod ID {PK} to Committed Prod_ID in Contract_1.
When I write a query to show a summary of the products and total price, I get
Product| Unit Price| Quantity| Total Price|
Light Bulb| $5.00| 2| $10.00
Light Bulb| $5.00| 3| $15.00
In my data i have 2 Contracts, contract ID 1 and 5, that both purchased light bulbs. But since they are the same product, how can I make them appear as a total of 5 instead of 3 and 2?
I tried using GROUP BY, but it does not work. My current query looks like this:
SELECT [Contract Items].Product,
[Contract Items].[Unit Price],
Contract_1.[Actual Qty] AS Quantity,
[Unit Price]*[Quantity] AS [Total Price]
FROM [Contract Items]
INNER JOIN Contract_1
ON [Contract Items].[Prod ID]=Contract_1.[Committed Prod_ID]
GROUP BY [Contract Items].Product,
[Contract Items].[Unit Price],
Contract_1.[Actual Qty],
[Contract Items].[Quantity];
Thanks!

Answer 1

Try this(EDITED), what #jarlh is saying :
SELECT [Contract Items].Product,
[Contract Items].[Unit Price],
SUM(Contract_1.[Actual Qty]) AS Quantity,
SUM([Contract Items].[Unit Price]*Contract_1.[Actual Qty]) AS [Total Price]
FROM [Contract Items]
INNER JOIN Contract_1
ON [Contract Items].[Prod ID]=Contract_1.[Committed Prod_ID]
GROUP BY [Contract Items].Product,
[Contract Items].[Unit Price];

Answer 2

In that case first get the count and then do a join and calculate the total price like below
SELECT [Contract Items].Product,
[Contract Items].[Unit Price],
tab.Quantity,
[Contract Items].[Unit Price] * tab.[Quantity] AS [Total Price]
FROM [Contract Items]
INNER JOIN
(
SELECT Committed Prod_ID,
count(*) as Quantity
FROM Contract_1
GROUP BY Committed Prod_ID
) tab ON [Contract Items].[Prod ID]=tab.[Committed Prod_ID]