How to calculate ROI of a project

Can you please show steps of calculation for the below 2 question as i got a different answer for both ques

1.Assume that a project's expected return is $180 million in 5 years for an initial investment of $100 million? How much debt should this project take to get a 10% ROI after debt payback? Assume 10% interest on the debt.

2.If you took $20 million as debt to fund a $200 million project. Assuming 10% interest on the debt and returns of $500 million in 5 years. What is your ROI?