Electrostatic force in a medium of non uniform permittivity

1. The problem statement, all variables and given/known data
Two point charges, +4 μC and -10 μC are placed 10 cm apart in air. A dielectric slab of large area and thickness 5 cm is placed between the charges. Find the force of attraction between the charges, if the dielectric has a dielectric constant of 9.

2. Relevant equations
F=(1/4πε)*q1*q2/r2
ε=ε0εr

3. The attempt at a solution
The electric field exists in a region of non uniform permittivity. Half of the region is free space while the other half is εr=9. Now should I consider the effective permittivity of the space b/n the charges? Or should I calculate the electric fields in the two different media or something like that?
Thanks.

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