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On the TI, you should input the respective cash flows and their frequencies if they’re recurring. Click the NPV button, put in the cost of capital, then move down one and press CPT for the answer. It also calculates the payback duration, and the discounted payback duration. If the cash flows don’t vary, you can solve NPV problems like a regular annuity.
For IRR, it’s simply clicking the IRR button after inputting the relevant flows.
Goodluck, and double check with what I wrote because I could be wrong.