114 triples, 144 quadruples

Divide 114 by the rate for tripling time, 144 for quadrupling.

Why it works

The same logarithmic trick as the Rule of 72, extended. At 7%: double in ~10 years, triple in ~16, quadruple in ~21.

Do it exactly

Estimate with the rule, then check it against the calculator that models it properly.

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