[Urgent!] - Equilibrium Problem

The equilibrium constant, K, for the following reaction

N₂(g) + O₂(g) ↔ 2NO(g)

is 4.00 x 10⁻² at a very high temperature. The reaction is at equilibrium at this temperature with [N2] = [O2] = 0.100 M and [NO] = 0.0200 M in a 2.00 liter flask. If 0.120 mol of NO is suddenly added to the reaction mixture what will be the concentrations of all species when equilibrium is re-established?