Consider the case in which 10wt% Sn is added to Pb in order to strengthen it. The yield strength of the resulting Pb-Sn alloy is given by the equation: Oy = 150 + 25 VW + 12vT where W is the amount of B phase (in wt%) and C is the concentration of Sn in the a phase (in wt%). Calculate the yield strength of the alloy at 100C. [Hint: Use the Pb-Sn phase diagram provided below. Choose the closest answer] 327C 600 300 Liquid 500 232C a + L 200 B+L 400 183C 18.3 61.9 97.8 300 100 a + B 200 100 Temperature (C) Temperature (F) 300 MPa O 160 MPa 235 MPa O 190 MPa