I bought some merchandise with a ticket price of $429. However there was a 15% holiday discount, so I actually paid less than that.

The next day, I needed to exchange the merchandise, so I chose other items with a ticket price of $439, and the same discount. Just $10 more, so after the discount I needed to pay an additional $8.50, right?

Wrong. I had to pay an additional $9.

On checking the bill, I was quickly able to confirm that there was no error in the shop's calculation.

What is the explanation?

Did this puzzle 01134 437, 468 35 13?

                ANNOY YOU, YES or NO?

188bet

W1 = Russian for YES = 468

W2 = ??????? for NO = 13

W3 = French for EASY = 6084

468*13 = 6084