A poor day!

Yesterday in steak house I compensated 120 NT dollars to the boss. At first, everything was going well. Unfortunately, when a customer paid the bill with a VIP card, originally it should sell by 10% discount. But today is holiday, so I can't give a discount to VIP. Nevertheless, I forgot it. I gave her discount. Her consumptive total was more than 1000 NT dollars, so I have to pay for the amount of the discount. What a poor day! I would never forget it after yesterday's experience.