From the archive
Thursday, 17 September 2026
PV converts a stream of equal future payments into the single amount, deposited today and left to earn interest, that would fund every one of them.
You manage the scholarship endowment for a small college's engineering department. Three named funds each pay a fixed amount to a recipient every year for a set number of years, and each fund earns its own annual interest rate while the money sits invested. In E2, work out how much needs to be deposited into the fund today so it fully covers its payouts, using PV, then copy down through E4. In E5, total the three deposits, so the department knows how much it needs to raise before any of the funds can open.
A new exercise every morning, plus every day that came before it — a back catalogue that grows by one a day, whether or not you were here for it.
The last 14 days. Today's challenge is free while your streak is alive; Pro opens every past day too.