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Suppose that in January 2040,you buy a 30-year zero-coupon U

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Suppose that in January 2040,you buy a 30-year zero-coupon U.S.Treasury bond with a maturity value of $100,000 and a yield of 5% annually.
(a) How much do you pay for the bond?(Round your answer to the nearest cent.)
$
(b) Suppose that,15 years later,interest rates have risen again,to 12%.If you sell your bond to an investor looking for a return of 12%,how much money will you receive?(Round your answer to the nearest cent.)
$
(c) Using your answers to parts (a) and (b),what will be the annual yield (assuming annual compounding) on your 15-year investment?(Round your answer to two decimal places.)
%
  假设你买x元.算出x
x*(1+5%)^30=100000
上一题的x,本题算出下面这个等式就行了
x*(1+5%)^15=
上一题的答案-X,然后除以15