Answer:
Option b is correct
Average annual return = 21%
Explanation:
Average rate of return = Average operating income/average investment
Average income = total income for the investment period/Number of years of investment
Average income = (100,000 + 60,000 + 30,000 + 10,000 + 10,000)/5
=210,000/5 = 42000
Average investment = (Initial cost + scrap value) / 2
= (400,000 + 0) / 2 = 200,000
Average annual return = 42,000/200,000 × 100
= 21%
Average annual return =21%