Suppose that someone owns a 30​-year ​$21 000 ​T-bond with a rate of 6​%. After 5 years the bond is sold for​ cash, but interest rates have fallen to 3.5​%. ​(a) How much has the bond paid in total for the first 5 ​years? ​(b) How much will the bond pay the person buying it over the next 25 ​years? ​(c) How much is the bond currently​ worth?
​(a) Over the first 5 ​years, the bond has paid​$ ____. ​(Simplify your​ answer.)
​(b) Over the next 25 ​years, the bond will pay the buyer ​$ _____. ​(Simplify your​ answer.)​
(c) The bond is currently worth ​$ _______.