I mean- it's math. It's not like he studied things like finance or economics where math was important when he was in college or afterwards. Surely a guy who was aptly able to run a casino and other fail-proof money makers would only be able to make millions and billions. Or if you created a beverage company, a food company, or an airline, ..surely you'd need to be able to add, subtract and multiply...and even divide. You know percentages are so easy. Only a complete and total moron would get those wrong.