Ive been having difficulty solving this as well and need help

Return on investment is often expressed as follows: ROI Controllable margin Controllable margin Sales = = x Average operating assets Sales Average operating assets (b1) Comparative data on three companies operating in the same industry follow. The minimum required ROI is 10% for all three companies. Determine the missing amounts. (Round asset turnover of Company B and return on investment of Company C to 1 decimal place, e.g. 15.2 or 15.2% and all other answers to 0 decimal places, e.g. 152. Enter negative amounts using either a negative sign preceding the number e.g. -45 or parentheses e.g. (45).) Sales $1,352,000 $682,800 (a) $:l Net operating income $162,240 $122,904 (b) $l:l Average operating assets $676,000 (c) $:l $4,926,000 Prot margin (d) "/0 (6) [:J % 0.6 \"/o Assets turnover '0 (9) |:] 4 Return on investment (h) % 1'8 % (l) l:l % Residual income 0) $ (k) $:l (l) $:l