Equilibrium Constant Calculation for a Gaseous Reaction

Consider the following equilibrium reaction at a certain temperature:

A(g) + B(g) <=> C(g) + D(g)

At equilibrium, the concentrations of the gases are as follows:

[A] = 0.2 M, [B] = 0.3 M, [C] = 0.5 M, [D] = 0.4 M

What is the equilibrium constant (K_c) for this reaction at the given temperature?