IRR calculation with Initial Investment disbursed on two years

In my case, I think:

Numbers say more than words.

So, I’ve simplified the financial situation in this image:

Here is the Excel file.

How to calculate the Internal Rate of Return (IRR) with such a data? I know Excel has the IRR function, but what financial statement values should I use as IRR function parameters for the calculation?

1750000 (1 + r)^9 + 1750000 (1 + r)^8 = 247733109

∴ r = 0.644646