What amount will be tax free if I withdraw out of this fund now?

My wife passed away 27/12/2015. She did receive on retirement 25/02/2010 lump sum of R 378 634. Tax free portion R300 000 and balance was taxed. 2/3 invested into retirement fund.

Are you planning on withdrawing the entire amount?

What will the tax be on the whole amount?

What part will be totally tax free?

If this amount was then transferred to you on death, then it will be taxed according to the tables again, however tax paid previously will be deducted.