Rooney corporation’s balance sheet indicates that the company has $630,000 invested in operating assets. during 2018, rooney earned operating income of $79,380 on $1,260,000 of sales. required compute rooney’s profit margin for 2018. compute rooney’s turnover for 2018. compute rooney’s return on investment for 2018. recompute rooney’s roi under each of the following independent assumptions: (1) sales increase from $1,260,000 to $1,512,000, thereby resulting in an increase in operating income from $79,380 to $90,720. (2) sales remain constant, but rooney reduces expenses, resulting in an increase in operating income from $79,380 to $81,900. (3) rooney is able to reduce its invested capital from $630,000 to $504,000 without affecting operating income.\