Duty for a Receiver without receipt

Hi,

I am starting to Bangalore after 2 months stay at US. Here I purchased one YAMAHA receiver from my friend for 90 dollars, who actually got that from 'Best Buy' in 2007 for 240 dollars. He has a receipt for that on his name. Suppose if I take it along with me will Indian custom officials allow it? or will they expect receipt on my name? If paying duty is enough then how much they will expect?

Thanks in Advance