A reaction takes place in a continuous flow stirred tank reactor (CSTR). The volumetric flow rate into the reactor is given by Q = 200 L/min, and the volume of the reactor is V = 500 L. The reaction rate constant is given by k = 0.05 min^-1. The initial concentration of A (reactant) is CA0 = 2 mol/L. Find the concentration of A (CA) after 20 minutes of operation.