Answer:
Company's return on investment (ROI) = Net operating income / Average operating assets
Company's return on investment (ROI) = 380000/2000000
Company's return on investment (ROI) = 19%
Residual income = Net operating income - Return on investment*Average operating assets
Residual income = 380000 - 18%*2000000
Residual income = $20,000
ROI of new investment = Net operating income/Investment
ROI of new investment = 12950/70000
ROI of new investment = 18.50%
ROI of overall company if investment taken place = Total net operating income/ Total average operating assets
ROI of overall company if investment taken place = (380000+12950) / (2000000+70000)
ROI of overall company if investment taken place = 18.98%.