let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
Transposed = Table.FillDown(Table.Skip(Table.Transpose(Source),2),{"Column1"}),
Replaced = Table.TransformColumns(Transposed, {{"Column3", each if _ = null then 0 else _}}),
Changed = Table.TransformColumnTypes(Replaced,{{"Column1", type date}, {"Column2", type text}, {"Column3", Int64.Type}}),
HomNay = Date.From(DateTime.LocalNow()),
HomNayToiCuoiThang = Table.SelectRows(Changed, each ([Column1] >= HomNay )),
SumTungKhoan = Table.Group(HomNayToiCuoiThang, {"Column2"}, {{"Count", each List.Sum([Column3]), type nullable number}})
in
SumTungKhoan