Answer:
a) ROI = Net operating income / Operating assets
Computation of ROI of each division
Division Working ROI
Trucking ROI $116,000 / $600,000 0.1933 or 19.33 %
Seafood ROI $66,000 / $250,000 0.264 or 26.40 %
Construction ROI $63,000 / $350,000 0.18 or 18 %
b) Residual Income = Net operating Income - ( Operating Asssts * Desired ROI )
Where , Minimum level = ( Operating Asssts * Desired ROI )
Minimum level for Trucking = ($600,000*10 %) = $60,000
Minimum level for Seafood = ($250,000*10 %) = $25,000
Minimum level for Construction = ($350,000 * 10 %) = $35,000
Computation of Residual Income for each division
Details Trucking($) Seafood($) Construction($)
Net operating income 116,000 66,000 63,000
Minimum level 60,000 25,000 35,000
Residual income 56,000 41,000 28,000