Assign value of another table according to multiple conditions - powerbi

Question

I have two separate tables, without an existing relationship, similar to the ones below.
What I am trying to do is to multiply the SalesAmount by the respective Royalty slot, according to the following conditions.
Sales[Store] = Royalties[Store]
Sales[Year] = Royalties[Year]
Sales[Category] = Royalties[Category]
And then slot assignment according to this logic
SALES SalesAmount = 160
ROYALTIES
Slot 1 -- from 0 to 100 -- 5%.
Slot 2 -- from 100 to 200 -- 10%.
Then the value of royalties should be:
Slot 1 = 100 * 5% = 5
Slot 2 = 60 * 10% = 6
Royalties value = 5 +6 = 11
Tab. SALES
Store
Year
Category
SalesAmount
A
2022
X
250
B
2022
Y
260
Tab. ROYALTIES
INDEX
Store
Year
Category
n_slot
initial_value
final_value
royalties_pct
1
A
2022
X
1
0
100
5%
2
A
2022
X
2
100
200
7%
3
A
2022
X
3
200
300
9%
4
B
2022
Y
1
0
80
4%
5
B
2022
Y
2
80
160
6%
6
B
2022
Y
3
160
240
8%
How can I fix this to get the correct result?

Answer 1

If you feel like doing it in M / Powerquery
Code for SALES query
let Source = Excel.CurrentWorkbook(){[Name="SALESTABLE"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Store", type text}, {"Year", Int64.Type}, {"Category", type text}, {"SalesAmount", Int64.Type}}),
#"Added Custom" = Table.AddColumn(#"Changed Type", "Royalty", each GetRoyalties([Store],[Year],[Category],[SalesAmount]))
in #"Added Custom"
Code for function GetRoyalties which pulls from query ROYALTIES
( xStore as text, xYear as number, xCategory as text, xValue as number) as number =>
let #"Filtered Rows" = Table.SelectRows(ROYALTIES, each [Store] = xStore and [Year] = xYear and [Category] = xCategory),
#"Added Custom" = Table.AddColumn(#"Filtered Rows", "Custom", each if xValue>[final_value] then [royalties_pct]*([final_value]-[initial_value]) else if xValue<[initial_value] then 0 else (xValue-[initial_value])*[royalties_pct]),
Total = List.Sum(#"Added Custom"[Custom])
in Total