(1) Where any persons sells or purchases any taxable goods on behalf of his principal then such person and his principal shall both be jointly and severally liable to pay taxes on the turnover of such sales of purchases.
(2) If the principal on whose behalf commission agents have sold or purchased any goods, shows to the satisfaction of the Commissioner that the tax has been paid by the commission agents on such goods under sub-section (1), the principal shall not be liable to pay the tax against in respect of the same transaction.
(3) Where a manager or agent of a non-resident dealer sells or purchases any goods on behalf of a non-resident dealer in State, then the non-resident dealer and the manager or agent residing in the State, shall be jointly and severally liable to pay tax on the turnover of such sales or purchases;
Provided that, if the non-resident dealer shows to the satisfaction of the Commissioner that the tax payable in respect of such sale or purchases has been paid by the manager or agent residing in the State, then the non-resident dealer shall not be liable to pay tax in respect of the same transaction.