The following table is of profit, revenue, and number of employees of 10 companies. Profit US $ billion Revenue/employee No. of Employees US$ Exxon 11.7 96.170 122800 Royal Dutch 7.4 74,283 105150 British Petroleum 4.3 70.858 56450 Petrofina SA 2.7 67,394 69068 Texao In 3.1 92,104 29319 Elf Aquitaine 0.98 11,461 83700 ENI 3.3 37.418 80177 Chevron Corp. 3.5 84,624 39364 PDVSA 4.4 84,822 56594 SK 0.135 4,083 30591 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 $|US (Round answer to nearest whole number.) c) The "overall" mean profit per employee is $ US/employee. (Round answer to nearest whole number.)