How does the tutorial go?

There's a problem with Catherine's tip

Just before you start to go through the girls' assignments, you happen to glance at your smartphone to check how much you've been tipped so far today and when you do, you do an almost comical double-take. The balance is far higher than you expect. Checking the details, you see that Catherine has remitted you an astronomical sum.

"Um, I think you've put the decimal point in the wrong place here," you say, showing her the screen.

"No, I'm sorry Professor…I really thought that would be enough for five smacks. How much more would be appropriate?"

Your Rulebook-knowledge tells you that Catherine's family is, to use a technical term, filthy stinking rich, but if she continues to tip you at this rate, you'll be able to retire by the end of the year. On your own luxury yacht.

The strange situation makes you wonder whether tips are taxable. Of course, you can always fix it with the Rulebook if necessary, but you suspect that although most financial tips are tax-free, your position with the university means that those from your students will be classed as income, in the same way that only professional gamblers have to pay tax on their winnings, amateurs get to keep the lot.

"No, Catherine, it's too much, not too little. This is your family's money, correct? Then you need to use it more responsibly." You use your secure online banking access to decline the deposit and ask the blonde to send you a more reasonable sum. Clearly she needs to be educated about the value of money, but that's not really your duty. Of course, the many thrashings it will no doubt take to teach her the error of her ways could be most satisfying for you, so you might take on the job anyway.