12) cost of a hat: $39.95
markup: 10%
discount: 50%
tax: 4%

22.77

Step-by-step explanation:

39.95 * 1.14 (tax + markup) * 0.5 (discount) = 22.77 (rounded)

There is no list of items and their correct and incorrect prices, thus actual and accurate answers cannot be determined.

Step-by-step explanation:

N.B: Since no list is given, accurate answers cannot be given.  

The typing of the bar codes or prices manually in order to determine the price, can lead to errors in the selling price. This can be detrimental for business since undercharging or overcharging can occur.

For example, the price of a dress was recorded as $30 while it should have been $39. The price of a t-shirt was correctly recorded as $10. The price of a pair of jeans was recorded as $25 instead of $23. There are 2 errors in the selling prices found in the above example about clothing items.   the dress is undercharged and the pair of jeans is overcharged.