The resistance of a conductivity cell filled with 0.1 M KCl solution is 100 . If the resistance of the same cell when filled with 0.2 M KC solution is 520 , the molar conductivity of 0.02 M solution (in S cm^2 mol ⁻¹ ) is (Given : conductivity of 0.1 M KCl solution =1.29 Sm ⁻¹ )