I work in one of the business centers of Moscow. Lunch in the dining room that is in the same building. There is always the same cashier. So, yesterday I had no small things, and she forgave me the ruble. Today I come again, I pay, I pull 500, she takes the money, she looks at me and says:
I remember you. You have to give me 10 rubles.
Is it ruble, or is it already interest?
I remember, don’t argue, I have a good memory. How much money did you give me?