How to create a DAX formula to create another column based on the value in another column

Question

How do I create a formula in Dax that gives me the % achieved column, based on the location. When it is EU the % achieved formula should be actual*target else it should be actual+target

More background info: The actual is in a different dataset and target is also in another. Data modeling relationships created to link them together Tried using IF but getting error

Actual Dataset

Name	Location	Actual
John	EU	10
John	ASIA	4
Steve	EU	5
Steve	ASIA	87

Target Dataset

Name	Location	Target
John	EU	5
John	ASIA	5
Steve	EU	7
Steve	ASIA	9

View when relationships created on name and location. The new measure should give the % Achieved column

Name	Location	Actual	Target	% Achieved
John	EU	10	5	50
John	ASIA	4	5	9
Steve	EU	5	7	35
Steve	ASIA	87	9	96

Answer 1

Measure = IF(SELECTEDVALUE('Table'[Location])="EU", SUM('Table'[Actual]) * SUM('Table'[Target]), SUM('Table'[Actual]) + SUM('Table'[Target]))