Energy lost from sphere due to spark

[Janiceleong26]

1. Homework Statement

Homework Equations

The Attempt at a Solution

I did this :
1/2 (2.7x10^-6)(150x10^3) - 1/2 (1.575x 10^-6)(75x10^3) =0.143 J
But the answer is 0.15 , where did I did wrong?

 

[freddie_mclair]

I think it is: [(1/2) x (2.7x150) - (1/2) x (1.35x75)]x10^-3 = 0.152 J

 

[Janiceleong26]

I think it is: [(1/2) x (2.7x150) - (1/2) x (1.35x75)]x10^-3 = 0.152 J

Oh whoops, I read off the point wrongly, thanks!