Patel Limited uses the internal rate of return (IRR) to assess the viability of long term projects. The management accountant needs to assess the viability of project X and has calculated the net present value of the project at 6% at 1,627 and at 9% as (1,871) What is the IRR? a) 8.6% b) 6.5% c) 7.4% d) 52.5%