(b)such transaction is chargeable to securities transaction tax under that Chapter, the tax payable by the assessee on the total income shall be the aggregate of-(i)the amount of income-tax calculated on such short-term capital gains at the rate of ][fifteen per cent.] [ Substituted by Act 18 of 2008, Section 21, for " ten per cent." (w.e.f. 1.4.2009).][; and [Inserted by Act 23 of 2004, Section 26 (w.e.f. 1.4.2005).](ii)the amount of income-tax payable on the balance amount of the total income as if such balance amount were the total income of the assessee: