Temporary increase in taxes under certain Acts

During the period this Act is in force, there shall be levied and collected an increase in the tax payable under the principal Act by way of an additional tax at the rate of ten per cent. of the tax so payable under the principal Act, and the provisions of the principal Act shall apply in relation to the levy and collection of the additional tax as they apply in relation to the levy and collection of the tax under the principal Act.