to change the value of either of the parameters referred to in sub-rule (3) of Rule 3, on the basis whereof the annual capacity of production had already been determined would obviously require redetermination of annual capacity production of the factory/ mill, for the purpose of levy of duty. It is plain that in the absence of any other Rule, providing for any alternative formula or mechanism for redetermination of production capacity of a factory, on furnishing of information to the Commissioner as contemplated in Rule 4(2) of the 1997 Rules, such determination has to be in terms of sub-rule (3) of Rule 3. That being so, it must logically follow that Rule 5 cannot be ignored in relation to a situation arising on account of an intimation under Rule 4(2) of the 1997 Rules. Moreover, the language of Rule 5 being clear and unambiguous, in the sense that in a case where annual capacity is determined/ redetermined by applying the formula prescribed in sub-rule (3) of Rule 3, Rule 5 springs into action and has to be given full effect to.”