Analysts scratching their heads over the impact on India’s banks of the country’s move to ban high-value notes have every right to be puzzled, as estimates offered by the chairman of State Bank of India indicate. The bank could retain anything from 15 percent to 40 percent of the deposit boost it received after the government withdrew about four-fifths of the banknotes in circulation in November, Arundhati Bhattacharya said in an interview Wednesday with Bloomberg Television’s Erik Schatzker.