S. 80I : Industrial undertaking- For computing deduction under section 80I, it would be necessary to give effect to, and factor in, deduction allowed under section 33AC and if result of such deduction under section 33AC was that there was no profit from ship-Deduction under section 80I is allowable-Shipping business-Reserves-Reserve created to be primarily used for acquiring new ship- Cannot partake character of profit-Deduction inextricably linked to business of shipping with direct nexus to shipping operations brought out in provision itself-Total income-Income from capital gains and other sources contribute merely in computation of scale of cap on deduction-Profits of ship to be given effect to and factored in for computation of deduction under Sectionm80I- Provision for creating reserve to acquire new ship-Amendment not applicable to relevant assessment years prior to effective date-Proportionate allocation- Court cannot provide own basis and proportions for apportionment in appeal- Interpretation of meaning of word Ship in provision.[S.80I(3), 80I(6),260A]