Query To Collapse Mutliple Rows

Hello -

I am having a difficult time trying to generate a result set that collapses multiple rows into one. However, I am also getting some of the columns that I am trying to SUM, to double their value.

I have two tables as:

Table 1
EmpID (int), AcctID (int), ActivityDate(datetime), Process (nvarchar 20), Cost (money)

Table 2
EmpID (int), AcctID (int), ActivityDate(datetime), Process (nvarchar 20), Duration (smallint)

Some sample data:
Table 1
501, 7998, 04-2-2008, Process1, $100
501, 7998, 04-2-2008, Process2, $75

Table 2
501, 7998, 04-2-2008, Process2, 3

Result i need is:
501, 7998, 04-02-2008, $175, 3

What I am getting is:
501, 7998, 04-02-2008, $175, 6

Any suggestions or help will be appreciated.

Thank you
- will