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Exam details
=NPV(rate, value1, value2, ...) + initial_investment — NPV discounts from period 1; include the initial outflow (often negative) separately.
=IRR(cashflows) — first cashflow usually negative (investment), then inflows.
NPV: assumes equal-period intervals.
XNPV(rate, values, dates): handles irregular dates.
IRR: equal periods.
XIRR(values, dates): irregular dates — used when actual cash flow timing varies.
=INDEX(returnRange, MATCH(lookupValue, lookupRange, 0)) — more flexible than VLOOKUP.