S. 10 (23C) : Educational institution-Solely for educational purpose and not for earning profits-Substantially financed by Government-Eligible for exemption under section 10(23C)(iiiab) of the Act-Explanation to clause 10(23C)(iiiab) w.e.f. 1-4-2015 setting out minimum threshold of 50 per cent for institution to be financed by Government for claiming benefit of exemption under section 10(23C)(iiiab) is prospective in nature. [S. 10 (23C)(iiiab)]