On December 31, 20X7, P purchased 50 percent of S's bonds outstanding which were originally issued on January 1, 20X4, at 99. The total bond issue has a face value of $600,000, pays 10 percent interest annually, and has a 10-year maturity. Any premium or discount is amortized using the effective interest method. P paid $306,000 for its investment in S's bonds and intends to hold the bonds until maturity.

How do I calculate the bond discount?