Answer and Explanation:
The computation of the expected average rate of return is shown below:
As we know that
The average rate of return is
= Average net income ÷ average investment
where
Average net income = total income ÷ estimated life
And, the average investment = initial value + estimated residual value ÷ 2
So for 3D printer the average rate of return is
= ($24,080 ÷ 7) ÷ ($40,000 + $3,000) ÷ 2
= $3,440 ÷ $21,500
= 16%
And, for Truck
= ($36,400 ÷ 10 years) ÷ ($50,000 + $6,000) ÷ 2
= $3,640 ÷$28,000
= 13%