Exemption under section 35AC: school for mentally retarded children specified as eligible project, extended for three assessment years. The Central Government, acting under the Income-tax Act and on the National Committee's recommendation, specifies the Sabarkantha Charitable Trust's school for mentally retarded children as an eligible project or scheme, extending that specification for a further three assessment years commencing from assessment year 1999-2000, and confirms the project's approved estimated cost of rupees four lakhs sixty thousand.