Selling shares received as transfer & tax liability

Respected Sir/Madam,

My father transferred some of his shares of a few companies on my name. I  have a demat account as a primary holder and I hold shares of a few companies in my account. I have been holding those shares for more than 3 years now.

Say for example the valuation of those shares is currently 3 Lacs. Now if I sell those shares, I get say  around 3 lacs (excluding say brokerage etc).

What I need to understand is..

1.      Is the amount of 3 Lacs taxable under capital gains?

2.      If yes, what should be considered as the purchase price of those shares? I never spent any money from my pocket in purchase and now it’s not possible for me to even know the purchase price of those shares.

Thanks and regards,

Rajesh