Question: I solved this question using excel and got the IRR on the incremental investment as 29.92%. But I am not able to solve it without

I solved this question using excel and got the IRR on the incremental investment as 29.92%. But I am not able to solve it without excel. I want to see a step by step solution for calculating the IRR. I would want a complete solution where I am able to solve this question without using excel.
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