On June 30, 2021, Marc Industries had outstanding $800 million of 8% convertible bonds that mature on June 30, 2022. Interest is payable each year on June 30 and December 31. The bonds are convertible into 60 million shares of $10 par common stock. At June 30, 2021, the unamortized balance in the discount on bonds payable account was 540 million. On June 30, 2021, half the bonds were converted when Marc's common stock had a market price of $30 per share. When recording the conversion, Marc should credit paid-in capital-excess of par: a. 560 million. b. 580 million. c. $100 million. d. S120 million Please show solution step by step