" 6. "(1) The income, profits and gains of any previous year ending after the 31st day of March, 1948, which does not fall within paragraph 5 of this Order or of any previous year commencing after the previous year referred to in the said paragraph shall be assessed under the Indian Income tax Act, 1922, but the tax payable on so much of the income as pertains to the period ending before the 1st day of August, 1949, shall be determined as hereunder (i) the tax on so much of such income included in the total income shall be computed (a) at the Indian rate of tax and (b) at the rates of tax in force in the merged State immediately before the 1st day of August, 1949; (ii) the amount by which the tax computed under sub clause (a) of clause (i) exceeds the tax computed under sub clause (b) of clause (i) shall be allowed as rebate from the first mentioned tax, and the amount of the first mentioned tax as so reduced shall be the tax payable.