Tax computation for included interest now requires a two-part calculation and an average-rate adjustment. Amendment substitutes clauses (a) and (b) of section 112A (effective 1 April 1968) to require a two-part tax computation: (a) tax on total income reduced by the inclusion, as if that reduced figure were total income; plus (b) tax on the included interest at the average rate that would have applied had that interest, any compensation referred to in clause (ii) of section 28, and any capital gains not formed part of the total income. Explanation 1 to section 112A is omitted effective 1 April 1969.