How do I multiply by a value in a related table before aggregating?

[graemeharker]

I have a Sales fact table with Revenues of products in Categories like this:-

Category	Revenue
BLUE	$12.00
BLUE	$13.00
RED	$56.00
RED	$17.00
RED	$123.00
RED	$2.00

A sales rep earns a commission on each sale according to a Rate. Each product Category has a different commission Rate.

I have a related Rates table that defines the Rate for each Category like this:-

Category	Rate
BLUE	5%
RED	3%

I want to show the commission in dollars earned by the sales rep by Category (and the total) in a matrix. I expect it to look like this:-

Category	Commision
BLUE	$1.25
RED	$5.94
Total	$7.19

How do I define a measure that multiplies the Revenue by the Rate (from the related table) BEFORE the results are aggregated by the SUM in the measure?

[Jihwan_Kim · Accepted solution]

Hi, @graemeharker 

Please try the below.

Commision =

SUMX( Sales, Sales[Revenue] * RELATED(Categories[Rate]))

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