Ionic Equilibrum

At $27^{\circ} \mathrm{C}$, the degree of dissociation of $\mathrm{H} A$ (weak acid) in 0.5 M of its solution is $1 \%$. The concentrations of $\mathrm{H}_3 \mathrm{O}^{+}, A^{-}$and $\mathrm{H} A$ at equilibrium (in $\mathrm{mol} \mathrm{L}^{-1}$ ) are respectively.