Adam has a project in mind that will require $$100$ of investment. The project will last for only one year and cease existence after that. Adam has only $$50$ of his own money and he needs to attract the remaining $$50$ by borrowing it from Bob. The loan has a $10\%$ annual interest rate. Suppose that there are four possible scenarios regarding the end$-$of$-$year cash generated by the business project: $1)$ $$140,2)$ $$100,3)$ $$80,$ and $4)$ $$40.$ Compute rate of return $($RoR$)$ in each scenario for Adam and for Bob.