There is no missing money I already showed that the problem is in the question they added a credit to a debit and you can not do that. The $1 needs to be subtracted and not added thus you get 97 at the end and not 99. 97 is the value of the shirt...

---------- Post added at 04:02 PM ---------- Previous post was at 03:55 PM ----------

Here it is another way: 50+50==100==97+3 && 97+3 == 50+50 && 97+1 == 49+49 && 49+49-1-97==0