Can any one explain me the concept of marginal costing?

Sam (-) (181 Points)

24 October 2012  

i know fixed OHS are treated as period cost.....we don't charge them to the product cost...etc...i know all that

I want to know the why is Marginal costing done....

What is the significance ..

Is it just a method of calculation or is there any reason to it

If you understand what i am saying.plz help 

thank you!

Use easy language