7) Huston Company, a manufacturer of office supplies, provides the following financial information: Pen Division Pencil Division Operating income Net sales Total assets at Jan. 1 Total assets at Dec. 31 $100,000 $500,00 $580,00 $610 $40,000 $150,00 $350,000 $300,000 Calculate the return on investment for the Pen Division. (Round your answer to two decimal places.) A) 16.81% B) 12.31% C) 17.24% D) 16.39%