shisha, you are right. The cashiers are trying to be over smart to take 25 or 50 dirhams from each customer that way and if they get enough then they will start leaving 25 or even 50 dirhams. If they collect 25 dirhams from 100 customers a day it will make 25 Riyals.

Do you think that this collection is going to the accounts of the Supermarket? No way, the cashiers will give only the exact amount to the accounts and will keep the rest with them.