Answer:
80%
Step-by-step explanation:
For computing the return on investment first we have to need the following calculations
New contribution margin = Old contribution margin + increase in contribution margin
= $260,000 + $30,000
= $290,000
And,
Net Income = Contribution margin - Total direct fixed costs
= $290,000 - $90,000
= $200,000
ROI = Net income ÷ average operating assets
= $200,000 ÷ $250,000
= 80%