67.674.  Additional tax imposed on goods subject to tourism sales tax, computation — report to county collector or to director of revenue, when. — The order imposing the tourism sales tax under the provisions of sections 67.671 to 67.685 shall impose upon all sellers within the area wherein the tax is to be paid an additional tax on all goods subject to tax included in chapter 144 except as otherwise limited in subsection 4 of section 67.671.  The amount reported and returned by the seller shall be computed on the basis of the tax imposed by the order as authorized by sections 67.671 to 67.685.  The seller shall report and return the amount so computed to the county collector unless the tax is imposed on all sales within the entire county that are subject to taxation under the provisions of sections 144.010 to 144.525, in which case the seller shall report the amount so computed to the director of revenue.