WOTC - Cost of high speed rail

I asked this question in the Wisdom of the Crowd:

How much will the High Speed Rail cost Singapore (make a guess)

Here are the responses: (58 Votes)

33 % - $20 billion
21 % - $2 billion
19 % - $5 billion
19 % - $10 billion
9 % - $500 million

See the pie chart at: 
http://www.wisdomofthecrowd.sg/chart.aspx?ID=871