The susceptibility of annealed iron at saturation is 5500 .

Susceptibility of annealed iron is $X=5500$ The relation between permeability and susceptibility is given by Permeability, $\mu=$ $\mu_{0}(1+x) \mu=4 \pi \pi \times 10^{-7}(1+5500) \Rightarrow \mu=4 \times 3.14 \times 10^{-7} \times 5501 \Rightarrow \mu=69092.56 \times 10^{-7} \Rightarrow \mu=6.9 \times 10^{-3}$