N=4; I/Y=7; PMT=10M*6%=.6M; FV=10M --> PV=-9,661,279
int expense = 9,661,279 * 7% = 676,290
coupon payment = 10M * 6% = 600,000
diff = 76,290
book value of the bonds at the end of the period :
=9,661,279 + 76,290 = 9,737,569.
the book value is not related to the current market yield
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