The following table is of profit, revenue, and number of employees of 10 companies. Profit US $ billion Revenue/employee No. of Employees US$ Exxon 11.5 96,180 122900 Royal Dutch 7.9 74,286 105150 British Petroleum 4.4 70,857 56440 Petrofina SA 2.4 67,391 69067 Texao In 2.9 92,108 29318 Elf Aquitaine 0.95 11,461 83700 ENI 3.5 37,419 80179 Chevron Corp. 3.5 84,619 39366 PDVSA 4.6 84,824 56598 SK 0.12 4,082 30595 a) For the 10 companies, the mean profit per company is $ billion US. (Round answer to one decimal place.) b) The "overall" mean revenue per employee (i.e., for all employees of these firms combined) of the 10 companies is $ (Round answer to nearest whole number.) c) The "overall" mean profit per employee is $ US/employee. (Round answer to nearest whole number.) US.