Based on the details given, the following are true:
First find coupon:
= 10% x 1,000
= $100
Bond A
= (Coupon x Present value interest factor of annuity, 13%, 15 years) + Face value of bond / ( 1 + 13%)¹⁵
= ( 100 x 6.462) + (1,000 / 1.13¹⁵)
= $806.09
Bond B
= Face value - Current value
= 1,000 - 180
= $820
In conclusion, Bond B is overvalued so your friend should pick Bond A.
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