This puzzle is set in fact and you could easily Google the answer. But think a while and realize what real gain (or prevention of loss) would this give.
Many shops have prices set just under a round figure, e.g. $9.99 instead of $10.00 or $99.95 instead of $100.00 . It is assumed that this is done because the price seems lower to the consumer. But this is not the reason the practice started. What was the original reason for this pricing method?
Original (and possibly still current) use not the common supposition. Answer on Saturday and new puzzle on Monday.