(iii)the business of a hotel which starts functioning, on or after the 1st day of April, 1990, ][but before the 1st day of April, 1991] [ Inserted by Act 49 of 1991, Section 31 (w.e.f. 1.4.1991).][, there shall, in accordance with and subject to the provisions of this section, be allowed in computing the total income of the assessee, a deduction from such profits and gains of an amount equal to twenty-five per cent. thereof: [Inserted by Act 12 of 1990, Section 24 (w.e.f. 1.4.1990).]