What is the stress of the chandelier?

a 50 kg chandelier is hung from the ceiling by an aluminum wire 2m long. a.)the tensile stress of al is 200 x 10^6 N/m, fing the minimum diameter of wire needed to support the chandelier. b.)when the full weight of chandelier pulls the wire, by how much does it strectch? 70 GN/m^2 for al youngs modulus. does this stretch seem reasonable