South Korea plans to sell a combined 7.75 trillion won ($6.84 billion) in state bonds next month, the finance ministry said Thursday.The government will issue 1.8 trillion won in bonds with a maturity of three years and 1.9 trillion won in five-year bonds.It also plans to sell 1.8 trillion won worth of 10-year Treasurys and a combined 2.25 trillion won of bonds with a maturity of between 20 and 30 years.For June, the...