Answer:
a. 21
b. $378,950
Explanation:
ROI = (Net operating income / Average operating asset)100
= ($612,150 / $2,915,000)100
= 21
Residual income = Net operating income - (average operating asset x minimum rate of return)
Residual income = $612,150 - ($2,915,000 x 8%)
= $612,150-$233,200
= $378,950
*we used controllable margin because it is in segmented department wherein fixed cost is more complicated to allocate each department.