A 25- $\mu$ F Capacitor Charged to 50 V and a Capacitor C

Multiple Choice

A 25- $\mu$ F capacitor charged to 50 V and a capacitor C charged to 20 V are connected to each other,with the two positive plates connected and the two negative plates connected.The final potential difference across the 25- $\mu$ F capacitor is 36 V.What is the value of the capacitance of C?

A) 43 $\mu$ F
B) 29 $\mu$ F
C) 22 $\mu$ F
D) 58 $\mu$ F
E) 63 $\mu$ F