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He is out the cap, which has a market price of 10r. He also gave the customer 15r. The customer leaves with the equivalent of 25r.
he still had 10r of the neighbor's real money in his register, which he has to give back to her along with 15r more of his own money. This comes to 25r to the neighbor.
That looks like 50r, unless I'm missing something.
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