Dielectric slab parallel to the plates

A parallel-plate capacitor has plates of area $A=0.020{\mathrm{m}}^2$ at a distance $d=3.0\mathrm{mm}$. A glass slab of area $A$, thickness $s=2.0\mathrm{mm}$ and relative permittivity ${\epsilon }_r=5.0$ is inserted between the plates, parallel to them. Compute the capacitance.