You don’t know that it is Tuesday though (and therefore don’t know how much money is affected by decision, unless the consequences for Monday and Tuesday are the same).
What you do on Mondays doesn’t matter (let’s simply life by assuming nothing is at stake on Monday, rather than a negligible amount). So you can assume it’s Tuesday for decision making purposes.
You don’t know that it is Tuesday though (and therefore don’t know how much money is affected by decision, unless the consequences for Monday and Tuesday are the same).
What you do on Mondays doesn’t matter (let’s simply life by assuming nothing is at stake on Monday, rather than a negligible amount). So you can assume it’s Tuesday for decision making purposes.