A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains a resistance R = 80$\Omega$, an inductor of inductive reactance $\mathrm{X_L=70\Omega}$, and a capacitor of capacitive reactance $\mathrm{X_C=130\Omega}$. The power factor of circuit is $\frac{x}{10}$. The value of $x$ is :