Section 11. Tax liability in case of minor or incapacitated person

11. In the case of any guardian, trustee or agent of any minor or other incapacitated person, carrying on business on behalf of and for the benefit of such minor or other incapacitated person, the tax shall be, levied upon and recoverable from such guardian, trustee or agent, as the case may be, in like manner and to the same extent as it would be leviable upon and recoverable from any such person or other incapacitated person, if he were of full age and sound mind and if he were conducting the business himself; and all the provisions of this Act and the rules made thereunder shall apply accordingly.