Calulate the energy stored in capacitor

[noname1]

a potential difference V = 100 V is applied across a capacitor arrangement with capacitances C1 = 12.0 µF, C2 = 6.00 µF, and C3 = 16.0 µF. Find the following values.

i calculated cnet and got 847e-6f
voltages across c1 and c2 i got 47.1

now i have to calulate the energy stored in capacitor 1

u = .5 x c x v^2
u = .5 x 12e-6 x 47.1^2 = 0.013J

but i am getting the answer is wrong can anyone confirm?

 

[Mindscrape]

How did you get cnet? C1 and C2 are in parallel, and effective capacitance of 1 and 2 is in series with C3.