7 Plus 13 Equals 27

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Again? 7 plus 13 equals 27. This afternoon, I went to a bookstore to buy an adhesive tape. That costs 7 pesos and since I have a 20 peso bill, I decided to get a charcoal pencil which I had seen at the entrance and costs 13 pesos per piece so it will be the exact amount. When I went to the cashier, I handed her the two items. She punched my items at the cash register and I had seen it totalled 27. I asked her how much even if I had already seen that it had shown 27. She said 27. I was not convinced. I asked her again how much, and she said again, 27. I took the pencil since that was the one I was unsure if it's really 13 but yes, it's tagged at 13 pesos. For the nth time I asked the lady how much should I pay and she still said 27, but already at a different tone. She might be thinking that I am already fooling her for asking so many times. But I asked her if shouldn't it be 20 and not 27. She still insisted it's 27, relying from her cash register. And then I said it should be 20 because it's only 7 and 13. It's good I was still cool at that time. And she realized that I am correct. I just smiled. She didn't even say sorry, but well, that happens.