FINANCE.XIRR(amounts..., dates..., rate_guess = 0.1)
Calculates the internal rate of return for a schedule of cash flows. The amounts and dates parameters must be the same length.
The first amount should correspond to the first date, and so on.
amounts: List of incomes associated with the investment.
dates: List of dates associated with the income amounts.
rate_guess: An estimate for the internal rate of return. Defaults to 0.1.
FINANCE.XIRR(amount1, amount2, amount3, date1, date2, date3, 0.5)