Mass changed if q is produced by adding to electrons mass

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Can someone walk me through calculating the final step in this problem.

Problem statement:

If the charge q is produced by adding electrons to the mass, by how much will the mass be changed?

It was calculated that the charge q is 2.374 * 10^-7 C which is correct and I know that we need to balance (m + m')g = ?

If I were in different units I would balance this with q * e/(2 * epsilon_0)
I just don't know what I'm supposed to be balancing this with to solve for m'

The mass is .0227 kg and the charge is suspended .0477 m above a nonconducting plate.
 
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Nevermind I figured it out

m = [(2.374 * 10^-7)/(1.6 * 10^-19)] * (9.11 * 10^-31)