S.37(1): Business expenditure-Payments for medical treatment of director of assessee abroad-Produced board resolution approving treatment and return of chairman declared the amount as perquisite-Matter restored to the file of Assessing Officer for verification-Offence-Payment of interest on customs duty on direction of Supreme Court-Allowable as deduction-Delayed payment of contributions to provident fund-Not allowable as deduction. [S.36(1)(va), 37(1), Expl.1]