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Another True Story (Posted on 2018-05-22) Difficulty: 2 of 5

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?

No Solution Yet Submitted by broll    
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Solution this must be how | Comment 1 of 2
The store must be giving the customer the benefit of rounding their discount up to the next exact dollar.

A 15% discount on $429 would make the price 364.65, but with the discount rounded up, the discounted price is rounded down, to $364.

The next day, exactly 15% off $439 would have been 373.15, but rounding the discount up and the discounted price down, brings the amount due to $373, nine dollars more than the day before.

  Posted by Charlie on 2018-05-22 09:49:08
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