Answer:
18 %
Step-by-step explanation:
Annual rate of return on this investment = annual profit / average investment x 100
where,
annual profit = $108000
average investment = (initial cost + salvage value) ÷ 2
= ($900000 + $300000) ÷ 2
= $600,000
therefore,
annual rate of return on this investment = $108000 / $600,000 x 100
= 18 %