The richest man of all time, when wealth is measured as a percentage of the national economy, was John D. Rockefeller, whose fortunes made Gates' and Buffet's look downright puny. Keeping score of who's wealthier is like a spectator sport with Forbes magazine as its official referee.
OH NO, I am not allowed a calculator on the MCAT!!! If you reading this you have probably completed all the general requirements to take the MCAT. Thinking back over your semesters of chemistry you would of used your calculator a lot to complete the math problems ranging from the basics of stoichiometry to the complex problems of solving the pH of a weak acid.
1 A recommended sequence of lectures, modeled after the Examkrackers Comprehensive MCAT Course, is included in the detailed weekly study plan.  Take practice exams. Taking practice exams will help you stay in touch with the MCAT to shape your study of the content and help you build endurance for Test Day. Taking practice exams forces you to actively engage with the material and practice MCAT skills. Studying without MCAT practice (i.e. only reviewing content) is passive.