b) Attached Phase Diagram for mixed metal System Pb-Sn with composition of 40 wt% Sn-60 wt% Pb. b1) determine the presentation of alpha and L phases at temperatures above Eutectic Temperature (TE) assuming Co 318.3 wt% Sn and C= 61.9 wt%Sn and b2) determine the percentage of alpha and betha phases at temperatures below TE assuming Co = 18.3 wt%Sn and CB = 97.8wt%Sn. 18.3 wt% Sn