Thornton Corporation's balance sheet indicates that the company has $660,000 invested in operating assets. During 2018, Thornton earned operating income of $87,120 on $1,320,000 of sales. 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 ROI under each of the following independent assumptions: (1) Sales increase from $1,320,000 to $1,584,000, thereby resulting in an increase in operating income from $87,120 to $95,040. (2) Sales remain constant, but Thornton reduces expenses, resulting in an increase in operating income from $87,120 to $89,760. (3) Thornton is able to reduce its invested capital from $660,000 to $528,000 without affecting operating income. Complete this question by entering your answers in the tabs below. Reqs A to C Reg D Compute Thornton's profit margin, turnover and return on investment for 2018. (Round "Profit margin" and "Return on investment" to 1 decimal place.) Profit margin Turnover Return on investment times Reqs A to C Reg D Recompute Thornton's ROI under each of the following independent assumptions: (Do not round intermediate calculations. Round your answers to 2 decimal places. i.e., .2345 should be entered as 23.45).) (1) Sales increase from $1,320,000 to $1,584,000, thereby resulting in an increase in operating income from $87,120 to $95,040. (2) Sales remain constant, but Thornton reduces expenses, resulting in an increase in operating income from $87,120 to $89,760. (3) Thornton is able to reduce its invested capital from $660,000 to $528,000 without affecting operating income. Show less Return on Investment (1) (3)