Electrostatics: JEE Main 2025 Physics question

A point charge causes an electric flux of $-2 \times 10^4$ $\mathrm{Nm^2C^{-1}}$ to pass through a spherical Gaussian surface of 8.0 cm radius, centred on the charge. The value of the point charge is : (Given $\epsilon_0 = 8.85 \times 10^{-12}$ $\mathrm{C^2N^{-1}m^{-2}}$)