According to a research, I have summarized some steps to improve my problem solving skill:

1.        Identify issues of problem, and analyses the reason causes this problem.

2.        Brainstorm and list all relevant information.

3.        Think widely and deeply in order to find the best alternative solusion.

4.        Apply it to the real action.

5.        Monitor the action that I apply and make adjustment if it is not correct.

( QIA, n,d.)

Next time when I quote an exchange rate on a phone, I must mention that is a floating exchange rate, if I really forget about it again coincidently, I will offer some discount to the customer and make it even.