Answer
The value of this investment is $38800 at the rate of $1700 per year
Explanation
If an investment in the year 1980 worth $28600 and in the year 1986 it was worth $38800, then the value of this investment is $38800.
To find the rate, the following formula applies:
[tex]\frac{\text{Change in Investment worth}}{\text{Change in years}}=\frac{38800-28600}{1986-1980}=\frac{10200}{6}=\text{\$}1700\text{ per year}[/tex]
Therefore, the value of this investment is $38800 at the rate of $1700 per year.
