New Delhi, Jan. 11 -- India's $2.7 trillion economy is headed for a slowdown ahead of national elections due by May, with a federal statistics body projecting an overall economic growth of 7.2% for the year ending 31 March. With the economy already recording 7.6% growth in the first half (April-September) of the fiscal, this implies it will grow at around 6.8% in the second half (October-March). The Central Statistics Office (CSO) on Monday released the first advance estimates for the current fiscal, mainly for the finance ministry to use as a base for its calculations in the interim Budget to be presented on 1 February. CSO's 7.2% figure is slower than the Reserve Bank of India's estimate of 7.4% growth in its latest monetary policy. Howev...