geometry - Finding the number of Circle or Circles in a Circle

Let a circle $A$ which radius is $10 m$ and another circle is $B$ which radius is $0.2 m$.Is it possible to say that what is the maximum number of circles $B$ can be drawn in circle $A$?

I tried much but failed to calculate the area among four circles.Is there any general way to solve this type of problem.Please help me.