multiply several columns by another column using M

I have a table that looks like this:

I want to multiply each of the Salary, EBP and OH columns by Quantity, resulting in a table that looks like this:

I know that I could beat it to death by adding 3 new columns and then removing the source columns.  e.g.

= Table.AddColumn(#"Source", "salaryCost", each [quantity] * [Salary], Currency.Type) 

= Table.AddColumn(#"addCol1", "ebpCost", each [quantity] * [EBP], Currency.Type) 

= Table.AddColumn(#"addCo2", "ohCost", each [quantity] * [OH], Currency.Type) 

= Table.RemoveColumns(#"addCol3",{"Salary","EBP","OH"}

But that is not very elegant.

I thought I might be able to do something like this:

= Table.TransformColumns( #"Source", {{"Salary", each Value.Multiply(_,[quantity])},{"EBP",each Value.Multiply(_,[quantity])},{"OH",each Value.Multiply(_,[quantity])}})

but I can't figure out how to get the value of [quantity] into Value.Multiply.  Is this even possible?

Is there a better way?