(3)An exemption under sub-section (1) or sub-section (2) in respect of any excisable goods from any part of the duty of excise leviable thereon (the duty of excise leviable thereon being hereinafter referred to as the statutory duty) may be granted by providing for the levy of a duty on such goods at a rate expressed in a form or method different from the form or method in which the statutory duty is leviable and any exemption granted in relation to any excisable goods in the manner provided in this sub-section shall have effect subject to the condition that the duty of excise chargeable on such goods shall in no case exceed the statutory duty.Explanation. Form or method , in relation to a rate of duty of excise means the basis, namely, valuation, weight, number, length, area, volume or other measure with reference to which the duty is leviable.
