New Delhi, January 13: Retail inflation inched up to 7.35 per cent in December, which is far higher than the retail inflation in the same month last year at 2.2 per cent. Earlier, the CPI inflation in November rose from 4.62 per cent to 5.54 per cent, which was highest in the last three years. The CPI number has breached the medium-term target of the Reserve Bank of India for the third month in a row, as the central government has mandated the Reserve Bank of India to keep inflation in the range of 4 per cent with a margin of 2 per cent on the either side