$4(25).$Some data is given about a project below: Life$=3$ years Cost of Project now$=100$ Cash inflows for next $2$ years is $80$ tl every year. However, at the end of the third year he has to spend $10$ tl for the repairs. a$.(15).$What is the profitability of the Project? b$.(10).$How will he decide on the Project?