 What if I want to find out how much I'm paying interest or principal for a given amount of time between periods? That's actually, again, if we look at this amortization schedule, kind of confusing. I would like to maybe know how much I paid on interests this year. We can actually do that instead of doing a sum and having to calculate it out. We're able to actually use the CUME interest payment function. Now, that does exactly that. It's going to look at all of these different factors that we have, like our rate. Now, make sure to F4 that, like our in-per, make sure to F4 that. Now, PV, one more. Now, when we get to start period in-period, this is actually saying, again, we're looking for the cumulative interest that I had to pay between two different periods. Since I know that the periods were basically one to twenty, I can say that my start period was at payment period one to payment period four. Now, we do have to specify the type, and just so you can see that, type actually refers to when the payment happened at the end of the period at zero or at the beginning of the period one. For our sake, we'll go ahead and just make it one, or zero, zero. Now, when I hit enter, you see that across the first year, I paid about $20,000 in interest alone. It's a lot, but as I auto-fill this across, you're going to see that over time my interest, the amount I've paid in interest, got lower, and my auto-sum for this indicates that I made in total about $60,000 worth of interest. I was paying just on that. Now, principle, as you can guess, I can do the exact same thing. I have a cumulative principle that I can work off of. P-R-I-N-C. And the same factor comes in. I need to know the rate. F4. I need to know the end per. F4. I need to know the PV. F4. I need to know the start and the end. And once again, since we said that the type was zero in interest, let's go ahead and at least keep that going here. We can see that my first payment, the first year, I spent about $51,000 in my amount towards my principle. And as I bring that across, you see as I moved throughout my five-year plan, suddenly I was paying a lot more towards principle in the end. So again, if we auto-sum this, we should see a total of $300,000, which exactly we do. Now, just so we can see it, I can apply a little bit of a principle remaining. Again, I started off with $300,000 on the balance. But then when we come down to year one, actually, sorry, we started with $300,000, but then we made payments of $51,000. Then when we come over here, we started the year at $24,248,000 still on our loan. And we added $55,000, or we pay back $55,000 to that. And we can then take this number, this number, auto-filling across. And what we should see at the end is, again, $0, because at the end of five years, we should have nothing left on our balance.