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I agree with John's answer, but I arrived at it using a slightly
different line of reasoning....
The 100 nC charge will spread equally over both surfaces of one
plate, while the -10 nC charge will spread equally over both surfaces of
the other plate. Thus the surface charge density on one plate will be 50
C/m^2 and -5C/m^2 on the other. Using superposition, the E field between
the plates is 55 C/m^2/epsilon0, ignoring edge effects. Integrating this
field from one plate to the other gives the potential difference (62.1 V).