Considering Xm = $40,000 and X= $28,000, and Xm and Xt are the average earnings for males and females, respectively. The following are the estimated simple human capital earning functions: Lux=9.2+0.1S and LnX=9.4+0.07S; S and Sy are the average number of school years for males and females, respectively. a) What is male to female wage ratio in logarithms? b) Using Oaxaca decomposition, find the unexplained differentials. c) Using Oaxaca decomposition, find the differential that is attributable to pre-market characteristics