Answer: Both of them would make the same decision
Explanation: Considering that they are two persons with the same incomes and the same interests, they also lost $ 10 in one way or another. That means, roughly, they will both make the same decision and pay another $ 10 to see the play that interests them. So the cost is the same, and the same is the benefit of watching the show with both Martha and Sarah because they both have the same preferences.