Applicability of form 10b for religious trust

If Income of a Charitable/Religious trust/Institution without giving effect of provisions of sec 11 and 12 exceeds basic exemption limit(Rs.250000) for A.Y. 2016-17 Accounts are required to be Audited and report to be submitted in the form of 10 B.(u/s 12 A(b)).

Sir, can you please explain how Rs.50000/- ?,  as section 12A(b) speaks that only the trusts exceding basic exemption limits are subject to Audit, hence subject to Form 10B.

Yes,You are right and Thanks for giving me a correction.

AIDIT LIMIT UNDER SECTION 12A(b) Rs.250000/- OR 50000/- FOR THE A. Y. 2017-2018 ? CAN YOU CLEARIFY