Moderate# Change in Capacitance

APPHEM-KN13CA

An air-filled capacitor has a capacitance of $C^{\circ}$. Then a dielectric with a dielectric constant of 3.0 is inserted into it and the plates are pushed toward each other so that the distance between the plates is reduced to $\frac{1}{2}$ the original value.

What is the new capacitance?