McNally's Gamble Quotes

“You divide seventy-two by ten and learn that in seven-point-two years you’ll have two million dollars. It works the other way too. Say you have a million dollars to invest and want to double it in five years. You divide seventy-two by five and learn you’ll have to get a yield of fourteen-point-four percent to do it.” “Crazy,” I said. “And this little trick works for any amount you want to invest, from ten bucks on up?” “That’s right.” “Explain it,” I urged. “Why the number is seventy-two and not, say, sixty-four or ninety-three.” Mr. Pettibone shrugged.”
― Lawrence Sanders, McNally's Gamble