Personal savings for retirement

Hi Mr. Tan Kin Lian
I enjoyed your blog. My friend told me that the savings in CPF is not sufficient for retirement needs. I have to supplement it with personal savings to be invested for my retirement. What is the amount that I should save? How is this computed?

REPLY
I usually advice people to save 10% to 15% of their regular earnings for the future. This should be invested in a low cost fund, preferably an equity fund to obtain the best return.

This is explained in this FAQ:
http://www.tankinlian.com/articles/savings.html