Power Query multiply Column list by row valuus

Hi, I would be interested in ways to achieve a column by row multiplication in excel SUM( TRANSPOSE( {2;3;4} ) *{1,1,0})*5 = 25

I have done this through Table to rows and then zipping them together and taking the product, but would like to know if there is a simpler way especially using unpivot which I have tried but end up with more steps than the original, which is;

let
    Source = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
    S = let alist =  
 Table.ToRows (  Table.RemoveColumns(Source,{"Item", "Unit"})) ,
zipl = List.Transform( alist, (A)=>
 List.Zip({A, TaxT[Amount]} )), 
prod = List.Transform(  zipl, (A)=> List.Sum(  List.Transform(A, (B)=>
  List.Product(B) ) )), 
rcol = List.Transform( List.Zip( {prod, Source[Unit]} ) , 
(A)=> List.Product(A) ) 
    in Table.FromColumns( 
      Table.ToColumns(Source) &{rcol} ,
      Table.ColumnNames(Source) &{"Result"} )
in
    S

I have included this a step by step version along with a unpivot, if anyone has ideas as a way to get the result without a lot of nested lists I would be interested.

Richard.

Thanks , that is more like what I was trying for, the nested list transforms took me a while to get right.
I will leave it open for the moment and I'd be interested if anyone has any ideas regarding unpivot.

Richard.