## Estimating the doubling rate

If something is growing at a rate of 5% per year, how many years will it take until it doubles? Common wisdom suggests itâ€™s approximately 70/5 = 14, but why?...

If something is growing at a rate of 5% per year, how many years will it take until it doubles? Common wisdom suggests itâ€™s approximately 70/5 = 14, but why?...