Q3: Where does the difference come from? Explination please.

Microsoft Bonds [FY2014] Total As of June 30, 2014, the total carrying value and estimated fair value of our long-term debt were and billion, respectively. These estimated fair values are based on Level 2 inputs. Q1: Were the 'September 25, 2015' bonds issued at par, a discount, or a premium? How do you know? Q2: What long-term debt value appears on Microsoft's FY2014 balance sheet? Q3: Why does the $20.6 billion "carrying value" differ from the $20.745 billion "face value"? Q4: Microsoft reported bond-related interest expense of $597M on its FY2014 income statement. Were cash payments in FY2014 more or less than \$597M? How do you know? Q5: If Microsoft redeemed 100% of its debt on June 30, 2014, would it recognize a gain or loss on redemption? How do you know