The true stress (in MPa) versus true strain relationship for a metal is given by $$\sigma=1020 \varepsilon^{0.4}$$. The cross sectional-area at the start of the test (when the stress and strain values are equal to zero) is $100 \: mm^2$. The cross-sectional area at the time of necking ( in $mm^2$) is ______________ correct to two decimal palces.