S. 35 : Scientific research-Facility is recognised by prescribed authority, in-house R & D-role of-Assessing Officer is to allow expenditure incurred on in-house R&D facility as weighted deduction-in computing 90 days limitation period as provided under Rule 34(5) for pronouncing order, period of Covid-19 pandemic lockdown was to be excluded. [S.35(2AB, S.255]