S. 37(1) : Business expenditure-Post-production expenses of feature film-Producer and distributor-Allowable as business expenditure-Rule 9A or Rule 9B is not applicable. Reassessment on change of opinion is bad in law-Resale of set material-Estimated at 5 per cent of total cost incurred on such set materials. [S. 143(3), 147, 148 Rule, 9A, 9B]