S. 144 : Best judgment assessment-Demonetization-Books of accounts cannot be rejected without issuing any show cause notice-Stock register-Purcahses verified by the Assessing Officer-Rejectiion of books of account is not justified-Cash sales-Deposited in the Banks-Books of account is audited by Chartered Accountant-Not justified by estimating income by applying NP Rate and books of accounts were to be accepted. [S. 68, 115BBE, 133(6) 143(3), 145(3)]