(7+4)*250=2750 (7+4)*300=2100 2750/2100=1.31
(7+4)*250=2750 (7)*290=2030 2750/2030=1.35
2*(1-0.45)*0.25 = 0.275
2*(1-0.55)*0.25 = 0.225
2*(1-0.85)*0.25 = 0.075
1 + 2*(1-0.85)*0.25 =1.075 1 + 2*(1-0.85)*0.25*0.5 = 1.0375 1.075/1.0375 = 1.036
=1.075
1.075 1 + (1+2*(1-0.85))*0.25*0.5 = 1.1625 1.075/1.1625 = 0.925
=1.075