Journal

The arithmetic, written out longhand

Four articles on the numbers that decide what you pay. No listicles, no dealership tips, just the mechanics with the working shown.

Articles4
Topics3
Average length6 minutes
Written byThe pricing desk

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The x2400 rule: turning a money factor into an APR you can argue with

Every lease and subscription quote has a finance rate buried in it. Here is the one multiplication that drags it into the open, and what to do once you can see it.

August 18, 2026 · 6 minute read · Dev Ramaswamy

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The arithmetic, written out longhand

All articles

Everything we have published

The x2400 rule: turning a money factor into an APR you can argue with

Read something that did not add up?