The capacitor of the given picture has an initial voltage...

The capacitor of the given picture has an initial voltage. If V0- 10 V, what is the current just after the switch is closed.

Picture: http://i718.photobucket.com/albums/ww182/Tahtorak/11-19_zps8b989b0b.jpg

please show how you got the answer.

I=(20-10)/4=2.5 amps