[amrsad]

Npbc corporation issued a new series of bonds on january1,2001. The bonds were sold at par (1000$), have a 12 percent coupon, and mature in 30 years, on December 31,2030. Coupon payments are made semiannually (on June 30 and December 31).
What was the yield-to-maturity of Npbc's bonds on January 1,2001?