Bart's Cookie Store is selling two types of cookies - vanilla and chocolate. Vanilla cookies sell at $1 per three pieces, while chocolate ones sell at $1 per two. At the beginning of the day Bart had 30 vanilla and 30 chocolate cookies. He sold all of them successfully (to his dad, of course), earning $10 + $15 = $25. Next morning Bart stocked up with 30 vanilla and 30 chocolate cookies again, but decided to simplify his accounting: *"Selling 30 cookies at $1 per 2 pieces and another 30 cookies at $1 per 3 pieces is way too complicated. Why don't I bundle things up and sell all 60 cookies at $2 per 5 pieces. Dad buys all of them anyway, so it's easier and result should be the same!"* Having done as decided, Bart sold all his cookies this day as well. Unfortunately, he discovered only $24 dollars in his cash register by the end of the day. Apparently, one has gone missing. Or hasn't it? ----- For other sophisms check out [my other posts](https://steemit.com/@konstantint).