Prime Minister Dr Manmohan Singh put in his papers before the President on Saturday. Dr Singh, who represents Assam in the Rajya Sabha, rushed to president Pranab Mukherjee at the Rashtrapati Bhawan at 12.30 in the afternoon where he tendered his resignation letters. Mukherjee accepted his letter and requested Dr Singh to continue the office till the next candidate takes over as the prime minister. Dr Singh, a professor and economist and former RBI governor was inducted in the Narasimha Rao cabinet as finance minister in 1991. In 1992, he was elected to the Rajya Sabha from Assam. Later in 20 04, when the party regained power he was sworn in as prime minister. He continued the office when the party retained power at the centre in 2009.