A fantastic bilingual website from the state of Odisha. English and Odia. Very informative especially for entrepreneurs as the name of website speaks of: bepara.com, bepara (byapar) is Odia for transactions/business. Here is a fantastic article written in Odia which I am translating partly to English. I am also appending the article as-it-is in Odia script, as its a valuable and interesting article by the title “Some simple rules”
Source and rights with: http://bepara.com/965/
“Some simple rules”
Rule of 72; An estimate of period by which capital gets doubled. “Annual compound interest rate” = 9% the 72/9 = 8th year gives “Capital doublization period”.
Rule of 114; Divide by 114, the interest rate (as above, compound interest rate) to get “Capital triplization period” (triplication)
Rule of 144; this gives like above period by which capital gets quadrupled (4 times “original capital” in 144/annual-compound-interest-rate)
Rule of 70; In how many days inflation can half your capital, is obtained by dividing instantaneous/current-inflation-rate by 70. (applied towards pension schemes)