Benjamin Franklin is silently judging everyone who gets this wrong. The store lost $100, not $130 or $70 or whatever creative accounting people are attempting. It's a simple conservation of currency problem—the kind of thing that makes mathematicians drink heavily after grading exams. The thief walks away with $30 cash plus $70 in goods, totaling exactly $100 of ill-gotten gains. The store's register is down one Benjamin. Basic arithmetic shouldn't require a PhD, yet here we are.
Conservation Of Currency: A Mathematical Tragedy
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