Beginner needs help with a problem

Assume I attempt to cook a steak in a microwave oven at 3.0GHz.

The permittivity of round steak at this frequency is ε = ε0*40(1 - j 0.3) .

How deep does the power penetrate the steak? What happens if you place your
McDonnell hamburger in a polystyrene foam box and put it into the
microwave oven?

I have no idea how do you start with this problem.

Can any one please help, thanks alot

yea i read through the "Skin Depth",

The skin depth of a substance is the distance to which incident electromagnetic radiation penetrates,

So the skin depth is how deep the power penetrate the steak?