You do realize the rule of 70 is used to approximate continuous compounding not periodic compounding right?
The rule of 70 isn't "hand waving bad math".. perhaps you just don't understand its derivation?
You do realize the rule of 70 is used to approximate continuous compounding not periodic compounding right?
The rule of 70 isn't "hand waving bad math".. perhaps you just don't understand its derivation?