S.14A : Disallowance of expenditure-Exempt income-Apportionment of expenses-Demat charges-Interest expenses-Disallowance under R. 8D(2)(iii) is to be restricted to 0.5 per cent of the average value of investment which yielded exempt income in terms of statutory formula-The suo motu disallowance, no basis has been given by the assessee for making such ad hoc disallowance-AO shall be guided by the statutory formula. [R.8D(2)(ii)]