Question 18 Supplement your calculations of the internal rate of return with calculations of the net present value of the copper mine investment under different discount rates:

In the range A21:A39, enter the discount rates from 1% to 10% in steps of 0.5%.

In the range B21:B39, add the value of cell $H$6 to the present value of the cash flows in the range $H$7:$H$32 using the NPV function with the corresponding discount rate in Column A.

I am struggling to find my mistake in the calculation, Screen clip 1 is my calculations, screen clip 2 is the correct answer.