Since my current tools for calculating the IRR directly are unavailable, let's walk through the process of calculating the IRR using a manual approach with a financial calculator or Excel:

Steps to Calculate IRR in Excel:

1. Input the Cash Flows:

   • In Excel, enter the following cash flows in cells A1 to A4:
     • A1: -350000
     • A2: 50000
     • A3: 100000
     • A4: 200000

2. Use the IRR Function:

   • In a new cell (say, B1), enter the formula: =IRR(A1:A4).
   • Excel will return the IRR value directly as a decimal. Multiply by 100 to get a percentage.

Steps to Calculate IRR Using a Financial Calculator:

1. Input the Cash Flows:

   • Enter the initial investment: $-350,000$.
   • Input the subsequent cash flows: $50,000$, $100,000$, and $200,000$ for years 1, 2, and 3, respectively.

2. Compute the IRR:

   • Use the IRR or CPT function on your financial calculator to compute the IRR.

This will give you the IRR percentage, which you can interpret as the return rate of the Moringa business investment. If the IRR is higher than the cost of capital (13%), the investment is generally considered good.

Let me know if you'd like more details or if you have other questions!