(l)"operating profit margin" in relation to operating expense means the ratio of operating profit, being the operating revenue in excess of operating expense, to the operating expense expressed in terms of percentage;(la)["relevant previous year" means the previous year relevant to the assessment year in which the option for safe harbour is validly exercised;] [Clause (la) inserted by the Income-tax (Twelfth Amendment) Rules, 2017, w.r.e.f. 1-4-2017.]
