Consignees of the agricultural wholesale markets, small business entities selling agricultural products, other small business entities, massage enterprises run by visually impaired persons who have duly obtained qualifications to engage in massage operation, and entirely staffed with visually impaired persons to provide massage services, and other business entities exempted by the Ministry of Finance from reporting their sales amount, shall compute their amount of business tax based upon the amount of sales as assessed by the competent tax authority and at the tax rate provided in Article 13, except in the case that the business entity has applied to calculate the business tax under Section 1 of this Chapter and file tax returns in accordance with Article 35.