New Delhi: Indian economy will grow by 7.4 per cent this fiscal, outpacing China to become the world's fastest growing economy, after a revision in the method of calculations. Aided by a 7.5 per cent expansion during October- December, Asia's third-largest economy will this fiscal see the fastest pace of growth since 2010-11 when it achieved 8.7 per cent, even as some doubts lingered on the revised methodology, PTI reported.