How can I multipy both cost and weight by Quantity?

I have been starting to use Space Design more but am struggling a bit with the calculations. I am sending you an example of our pricing at the moment to show you what I am trying to achieve. 

You will need to extend both the Cost field and the Weight field ("extend" means multiple the attribute for each component by the number of components.)

I have created a tutorial for this: How to extend Total Weight