Subject to the provisions of sections 6 and 7 every dealer liable to pay tax under section 3, who purchases goods, in circumstances in which no tax on sales is payable or has been paid on the sale price of such goods and either consumes such goods in the manufacture of other goods for sale, or otherwise, or disposes of such goods in any manner other than by way of sale in the State, or sale in the course of inter-State trade or commerce, shall be liable to pay tax on the puchase price of such goods at the same rate at which it would have beeb leviable on the sale price of such goods under section 14.