The assignment content discusses the calculation of the internal rate of return (IRR) for two projects, A and B, using the net present value (NPV) method. The IRR is calculated by subtracting the NPV at a higher discount rate from the NPV at a lower discount rate, then dividing by the difference in discount rates. Project A has an IRR of 21.43% while Project B has an IRR of 15.57%. As the IRR of Project A is higher than that of Project B, it is recommended to invest in Project A due to its higher profitability.