Answer:
B : $70,000
Explanation:
The formula and the computation of the  annual rate of return is shown below:
= Annual net income Ă· average investment
where, Â
Annual net income is XXXXX
And, the average investment would be
= (Original investment required + salvage value) Ă· 2
= (120,000 + $20,000) Ă· 2
= $140,000 Ă· 2
= $70,000
By placing these values we can easily compute the annual rate of return