Custom duty on second laptop

Hi,

I read that indian govt allows to bring one laptop duty free, if stay is more than 3 days. 

my friend is coming back from US and he is bringing his one laptop for him and one for me. So one is free for him and for the second one which is for me , he'll need to pay duty. I wanted to know how much will be duty on the item, I mean what is rate ?

Its urgent,

Please reply.