how do I calculate the NPV for these projects

Initial Outlay (105,000.00) (99,000.00) (110,000.00) (85,000.00) Inflow year 1 53,000.00 51,000.00 25,000.00 45,000.00 Inflow year 2 50,000.00 47,000.00 55,000.00 50,000.00 Inflow year 3 48,000.00 41,000.00 15,000.00 30,000.00 Inflow year 4 30,000.00 52,000.00 21,000.00 62,000.00 Inflow year 5 35,000.00 40,000.00 35,000.00 68,000.00 Rate 7% 10% 13% 18%