S. 145 : Method of accounting-Rejection of books of account is justified-Bulk journal entries in the books of account-Provisions of S.40(a)(ia),40A(3) cannot be applied-Companies engaged in the same line of business, have reported profitability in the range of 3 per cent to 9 per cent across these years-The profit of the assessee is to be estimated at 10 per cent of the contractual receipts. [S. 40(a)(ia), 40A(3), 153A]