With Somasroy ChakrabortyMUMBAI, August 17 (TickerNews Service): Mysore State Bank Tuesday said it has raised its main lending rate by 50 basis points, effective Wednesday.bank's prime lending rate is currently 12.25%, according to its Web site.Subsidiary India's largest lender State Bank of India has kept the minimum lending rate or base rate of 7.75%, which this time had increased by 50 percent and finally to re-stabilize.