Today you bought a little golden necklace for 8,900 baht to be a present for your mother's birthday. During the way to go back home, you suddenly saw a golden ring at the corner of street while an old woman walked to pick it too. She asked, "is it yours?" You said, "no." There were only you and that woman in the area then she invited you to sell it and share money, maybe it's 20,000 baht. You were in a hurry and couldn't wait, but you hesitated too. Then she offered you to give your golden necklace and she will give you the ring. (Actually that ring isn't golden ring and everything was the woman's plan, but you didn't know anything.)