mOdErN pHySiCs

r_n = bohr radius /z (z=atomic number)
let bohr radius =a
=> na =a/100
=> n=1/100
.....but the answer is not matching with the given ones !

the question says this : the radius of the atom in n times the bohr radius !

Then it shud be like this

a = na/100

So n= 100

Hence the ans

what ? whats this ? what is the logic ?
i say , a=bohr radius =>na= radius of the given atom !
also radius of an atom of atomic no Z= a /z = a/100