89A. Tax relief in relation to export turnover. — [Omitted by the Finance Act, 1983, w.e.f. 1-4-1983. The provisions of this section were later substituted by scheme contained in section 80HHC, inserted by the Finance Act, 1983, w.e.f. 1-4-1983. Originally section 89A was inserted by the Finance Act, 1982, w.e.f. 1-6-1982.]