regarding short term capital gain

CA Jaydev Modi (PRACTICE ) (49 Points)

12 February 2019  
I have openings wdv of 148000 OF CAR exchanged in month Oct for 160000 , in book of account I have entered short term capital gain RS 12000 , because block exist no capital gain will arise as per section 50 of INCOME-TAX ACT , how i can reduced such income from computation so it will not taxable under income tax act .