The question is unclear as to whether the short term capital asset which is the subject matter of discussion is a share on which stt has been paid at the time of sale or any other short term capital asset. Hence there can be two answers:
1. If the short term capital asset is a share on which stt has been paid:
Then as per the provisions of Sec 111A, the short term capital gain on transfer of shares on which stt has been paid will be taxable at a flat rate of 15%. It is also provided that in the case of a resident individual or a huf, where the gross total income before including therein the said short term capital gain does not exceed the maximum amount not chargeable to tax, then the benefit of the balance basic exemption limit can be availed against such short term capital gain.
Hence in this case,
Maximum amount not chargeable to tax : Rs.1,60,000.
Gross Total Income before including short term capital gains : Rs 1,50,000
Balance unadjusted basic exemption limit : Rs.10,000 [1,60,000-1,50,000]
Therefore balance short term capital gains after availing the benefit : Rs. 25,600 [35,600-10,000]
Tax on the same : 15% of Rs. 25,600 =Rs. 3,840.
2. If the short term capital asset is any other asset:
Then the short term capital gain is taxable at the normal slab rates.
Tax in that case would be : Rs. 25,600 @ 10% =Rs. 2,560
Plz note that i have ignored education cess for simplicity