Jim is a successful mining engineer. He used to work for Bid Mining Ltd$.$ On $1$ January this year, Jim entered into a $10$ years contract of service to work as the chief engineer for Judd Mining NL at a salary of $$100000$ per year. Judd Mining NL paid Jim $$20000$ as consideration for entering into the contract. On $31$ May this year, Jim received an offer from Arg Diamond to work for them at a salary of $$150000$ per annum. Jim asked Judd Mining to release him from the contract and they agreed providing Jim makes a payment of $$50000$ for the release. Jim made the payment on $30$ June this year and was released from the contract. After one year of working with Arg Diamond, Jim received $$40000$ from Arg Diamond for entering into an agreement in which Jim agreed to be bound by a restraint of trade condition that he will not work as a diamond mining engineer for two years following his future termination of employment with Arg Diamond. Advise quoting relevant cases: $$ How Jim will be assessed on the $$20000$ receipt from Judd Mining NL$?$ How Judd Mining NL will be assessed on the $$50000$ payment from Jim? $$ How Jim will be assessed on the $$40000$ receipt from Arg Diamond?