What Indian Constitution established authority estimated the money scandal around the 2G Spectrum scam?
2G spectrum scam:  The difference between the money collected and that mandated to be collected was estimated by the Comptroller and Auditor General of India at () , based on 2010 3G and BWA spectrum-auction prices. Comptroller and Auditor General of India: The Comptroller and Auditor General (C&AG) of India is an authority, established by the Constitution under Constitution of India/Part V - Chapter V/Sub-part 7B/Article 148, which audits all receipts and expenditure of the Government of India and the state governments, including those of bodies and authorities substantially financed by the government.
Comptroller and Auditor General of India