How to raise money using Debt



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in quiz. 3rd question- sir if 50 million is debt, interest will be 25 mn; so total amount to be paid is 75 mn. ROI is 180 mn. so 180 - 75 = 105 (profit). ROI should be 10%, investment is of 100 mn, so 105 / 100 . how it's 10% ?
4th question- debt-20 mn. project cost - 200 mn. so equity investment- 180. interest 10 % in 5 years- 10mn. ROI -500 mn. profit= 500 - 20 - 10= 470 mn.
ROI= 470 / 180. how it's 61% ?. please explain sir.