A 12-year bond with a face value of $1000 pays semiannual coupons at a rate of 5.1% per half year. The issuer of the bond has the option to redeem it at the time of the 16th coupon for $1900, or at maturity for $2000. Find the price that will guarantee an investor a yield rate of at least 12.9% convertible semiannually, regardless of when the bond is redeemed.