4 ms·
I love the rule of 72, but my calculus class affectionately called it the rule of 69.pi (69.314). More accurate (you can round to 72 in your head anyway) and so
by arjvik 5y ago
I love the rule of 72, but my calculus class affectionately called it the rule of 69.pi (69.314). More accurate (you can round to 72 in your head anyway) and so much more fun to remember.
- deleted 5y ago[deleted]
- bonzini 5y agoIt's not necessarily more accurate to use 69.3. If you expand the Taylor series to two terms you get an even better formula, 69.3/x+0.34. Write it as (69.3+0.34x)/x and it shows how, as the interest rate grows, using a dividend in the 70–72 range is more precise than 69.3. [That's another way to write the paragraph "A note on accuracy" from the article]