how shares are taxable u/s 111A..????

can u plz tell me how shares are taxable under sec 111A.....

are they taxable as per slab rate.....(exempted upto Rs.150000) and then taxable as per slab ????????

or at a flat rate of 15% (if income is although below Rs.150000) or (exempted upto Rs.150000 and then taxable at a flat rate.).