Ltcg 20% or 10%

PLS HELP ME   I WAS BOUGHT SHARE FROM MY COMPANY UNDER ESOP OPTION FOR  RS 75000/- AND SELL THE SHARE TO THE COMPANY UNDER BUYBACK FOR RS. 2100000/- CAPITAL GAIN IS LONG TERM CAPITAL GAIN AND WITH OUT SECURITY TRANSACTION TAX  SALE TRANSACTION IS COMPLETED IN MARCH 2013 PLS REPLY HOW MUCH TAX IS PAYABLE ON THE ABOVE CAPITAL GAIN. I AM CONFUSED WHETHER 20% OR 10% TAX . PLS SUGGEST.