Return Result Based On Multiple Criteria

I have been trying this for hours but to no avail.

I have a table with 4 columns headers
Name, Amount, Loc and Code

The name may look like ABC 1, ABC 2....
The Loc may be in US, GB...
and the Code may be AA, BB

I need to return a result "Y" if the sum of the amount is > 100
and "N" if the sum of the amount < 100 based on the conditions
of the following :if

1) Name is the same entity, such as ABC 1 and ABC 2 and
2) Loc is the same, US..and
3) Code is the same

I have attached a sample to illustrates the result