Jeff Lestz, CEO of Genistar said, ‘to save up that much money, he followed what he called the 10-10-10-70 rule of spending. For every pay check he earned during those years, he gave 10% to charity, saved 10% in a short-term easy-access fund, invested 10% in a long-term plan… and learned to live on the remaining 70%. “It’s not what you make — it’s what you keep,” he told Business Insider.’