Section 4(1A)(b) in The Gujarat Motor Vehicles Tax Act, 1958
(b)where such vehicle is to be used or kept for use in the State for a period less than a month, the tax shall be leviable at the rate of 4 per cent, of the annual rate for each week or part thereof, subject to a maximum amount equal to the amount of tax leviable for a period of one month under clause (c);