Does anyone else think question is really ambiguous ? .By Radius of circular medallion I thought it meant radius of small circle. Hence I calculated it this way.
Radius of medallion i.e. small circle = r, radius of metal frame = s
Total radius of medallion + metal frame = r+s
Total area of medallion + metal frame = pi * (r+s)^2
Area of metal frame = (Total area of medallion + metal frame) - area of small circle
pi*(r+s)^2 - pi*r^2. = pi*s(s+2r)
after doing all this calculation I noticed my ans is not matching with any of the answer choices , so I did the calculation again with the correct understanding.

. I understand such silly mistake of mine will have worse consequences in actual GMAT Exam. My question is how to avoid such mistakes. Please please please help.
Regards
Megha