1.what is the difference between 501 and 489
2.Harry and Micheal were having a ping pong match in the sports room in the evening.This was an important match because the winner would receive 300RMB.Harry won the first game,Michael won the second and Harry won the third.Suddenly,the lights went out,and they could not go on with the game.
问题是这样的:How much money would each of them get if they didn't continue with the match?Who would get more and who would get less?Why?