S. 143(3): Assessment-Rejection of books of account-Business Expenditure-Deduction of tax at source-Failure to substantiate expenditure with documentary evidence-Assessment of income at 12 Per Cent-On total disclosed revenue based on material available on record brought to knowledge of Assessee in notice-Writ petition is dismissed-All contentions of assessee is left open to be raised before Appellate Authority.[S. 40(a)(ia), 144B, 194C, 270A, Art. 226]