On June 30, 2021, Blair Industries had outstanding $106 million of 9% convertible bonds that mature on June 30, 2022. Interest is payable each year on June 30 and December 31. The bonds are convertible into 9 million shares of $10 par common stock. At June 30, 2021, the unamortized balance in the discount on bonds payable account was $4 million. On June 30, 2021, half the bonds were converted when Blair’s common stock had a market price of $43 per share. When recording the conversion, Blair should credit paid-in capital-excess of par: 

• $8 million. 

• $4 million. 

• $6 million. 

• $10 million.