I must agree that it is highly unusal for an emplyee to give one month's salary in addition to serving two (2) weeks' notice.
Have to look at the employment contract before I am able to advise further
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.