1) The richest man in the world is Bill Gates with a net worth estimated at $81 Billion dollars

Consider that he made this money in the 40 years or so since Microsoft was founded in 1975. If you presume that he has worked 14 hours a day on every business day of the year since then how much did he make per second?

If he wanted to spend all of his money how much would he have to spend every day for the rest of his life (assuming he lives another 20 years)