You buy a 30-year zero coupon bond with a face value of $1000 and a 3% interest rate, compounded semi-annually. The moment after you buy the bond, the interest rate falls to 2.5%, compounded...

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Extracted text: You buy a 30-year zero coupon bond with a face value of $1000 and a 3% interest rate, compounded semi-annually. The moment after you buy the bond, the interest rate falls to 2.5%, compounded semi-annually. What is the percent change in the bond price? Note: the sign is important!