Answer:
13.57%
Explanation:
Given the data :
Initial after tax cost = 5,000,000
Cash inflows:
Year 1 : $1,800,000
Year 2 : $1,900,000
Year 3 : $1,700,000
Year 4 : $1,300,000
The Internal rate of return can be obtained using the excel ;
IRR(Series of cash flow)
If the data above were inputed in an excel sheet from cell A1 to cell A4 ;
IRR(A1:A4)
Internal rate of return value obtained is 13.57%