Freight costs based on weight during standard costs creation

Hi Gurus

A message for moderator.

I created a message earlier for freight calculation in the standard cost estimate based on weight but you rejected the contents but I tried to look a specific solution to my problem, I could not find a solution. So please do not reject this messge

I need to add for an imported material

Duty 5% on mat consumption

Freight should be based on weight

We have EA is basic UOM in the material master and alternative unit of measurement is CAR

The weight each material is 0.50 lbs and is defined in the material master basic view 2.

Here as you know there is no BOM for these materials.

My question:

How will I compute standard cost using the freight with weight.

Please help

Nadhini