Discussion
The rule of 72 estimates the
Answer: D
Correct answer: time for a sum to double at a given interest rate
\[ n \approx \frac{72}{i}, \] with \( i \) as a percentage. At 8 per cent a sum doubles in about nine years, against the exact figure of 9.01. The approximation is good between about 6 and 15 per cent and is useful precisely because it needs no tables.
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