Answer
$2.86\,Am^{2}$
Work Step by Step
Recall that when the number of turns N=1, $\mu=iA$.
$\mu_{net}=\mu_{1}+\mu_{2}=iA_{1}+iA_{2}=i(\pi r_{1}^{2}+\pi r_{2}^{2})$
$=7.00\,A\times\pi((20.0\times10^{-2}\,m)^{2}+(30.0\times10^{-2}m)^{2})=2.86\,Am^{2}$
