If an optical medium possesses a relative permeability of 10/(π) and relative permittivity of 1/0.0885, then the velocity of light is greater in…

If an optical medium possesses a relative permeability of $\displaystyle \frac{10}{\pi}$ and relative permittivity of $\displaystyle \frac{1}{0.0885}$, then the velocity of light is greater in vacuum than that in this medium by $\displaystyle \_\_\_\_$ times. $$\left(\mu_0=4 \pi \times 10^{-7} \mathrm{H} / \mathrm{m}, \epsilon_0=8.85 \times 10^{-12} \mathrm{~F} / \mathrm{m}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right) $$