Set up and solve using Excel Solver.
Max: 3Xa + 5Xb + 3.5Xc+4.5Xd – 37Ya – 53Yb -45Yc-35Yd
S.T.
5Xa + 8Xb <= 835 - 3Xc-3Xd
22Xa + 18Xb + 30Xc <= 1950
Xa >= 105-Xd
Xa <= 9999Ya
Xb <= 9999Yb
Xc <= 9999Yc
Xd<=9999Yd
Xa, Xb, Xc, Xd >=0
Xa, Xb, Xc, Xd =Int (Integer variables)
Ya, Yb, Yc, Yd = Bin (binary variables)
Solved by F. Y. in 11 mins