Aug 4 (Reuters) - Computershare Ltd CPU.AX :
* Sale of 50% interest in karvy computershare
* Announces that it has agreed to sell its 50% interest in its Indian venture Karvy Computershare Private Ltd to General Atlantic
* Co expects to realise post tax proceeds of about US$90 million upon completion of Karvy sale
* Co expects a post-tax accounting gain on Karvy sale of about US$120 million