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 รท average investment
where
Average net income = total income รท estimated life
And, the average investment = initial value + estimated residual value รท 2
So for 3D printer the average rate of return is
= ($24,080 รท 7) รท ($40,000 + $3,000) รท 2
= $3,440 รท $21,500
= 16%
And, for Truck
= ($36,400 รท 10 years) รท ($50,000 + $6,000) รท 2
= $3,640 รท$28,000
= 13%