How is listing price determined

How is the listing price of any IPO determined officially

I mean Futurecapital IPO was subscribed overal around 133 times
and listed at 1081 against IPO of 750

Now Reliance power IPO subscribed overall by 69 times
so it will list at ..????

can anyone tell....

No one can determine the actual IPO listing price by just seeing the Xtimes subscription , there are so many factores which are affecting the listing price , one can guess the apx. listing price by refering grey market prices for their premiums, but the actual determination is not possible. we just need to see the promoters, fundamentals of the group etc...