(9)Where the Assessing Officer is satisfied that the total income of the buyer or licensee or lessee justifies the collection of the tax at any lower rate than the relevant rate specified in sub-section (1) or sub-section (1C), the Assessing Officer shall, on an application made by the buyer or licensee or lessee in this behalf, give to him a certificate for collection of tax at such lower rate than the relevant rate specified in sub-section (1) or sub-section (1C).