Question 1125679
3 possibilities:
first two are sales, with probability 0.25*0.46, and third is not with probability of 0.54=0.0621

first and third are sales or 0.25*0.54*0.25, 0.03375
second and third are sales with 0.75*0.25*0.46, 0.08625

The sum is 0.1821