Thornton Corporation's balance sheet indicates that the company has $660,000 invested in operating earned operating income of $87120 on $1,320,000 of sales. assets. During 2018, Thornton Required a. Compute Thornton's profit margin for 2018. b. Compute Thornton's turnover for 2018. c. Compute Thornton's return on investment for 2018. d. Recompute Thornton's ROl under each of the following independent assumptions: ales increase from $1,.320,000 to $1,584,000, thereby resulting in an increase in operating income from $87120 to $95,040 (3) Thornton is able to reduce its invested capital from $660,000 to $528.000 without affecting operating income es remain constant, but Thornton reduces expenses, resulting in an increase in operating income from $87120 to $89.760. Complete this question by entering your answers in the tabs below. Req A to C Req D Compute Thornton's profit margin, turnover and return on investment for 2018. (Round "Profit margin and Return orn investment" to 1 decimal place.) a. Profit margin b. Turnover c. Return on investment times