do not solve on excel

Two mutually exclusive alternatives (X, Y) having 4 year recovery period are under consideration for increasing productivity in an Energy company in Qatar. The cash flows of each alternative are shown below (in $). Answer the following: (a) Find the incremental ROR (%) using linear interpolation (refer to the provided factor tables of 10% and 15% ), and (b) Determine the better alternative between X and Y using the incremental ROR analysis (MARR is 8% per year). Year X Y 0 -200,000 -130,000 50,000 30,000 2 60,000 40,000 70,000 50,000 A 90,000 50,000