← Top stories● Neutral for Indian equitiesExplained: Want to know how long your investment will take to double? Use Rule of 721 source · first seen 09:53 3 Oct · updated 09:53 3 OctThe briefWritten from 1 report · check the source before you tradeRule of 72 estimates the years needed to double an investment by dividing 72 by its annual return rateRead the reports1 report · earliest 09:53Economic TimesExplained: Want to know how long your investment will take to double? Use Rule of 7209:53