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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, 190 122800 Royal Dutch 7.5 74,283 105100 British Petroleum 70,856 56460 Petrofina SA 67,393 69067 Texao In 92, 104 29315 Elf Aquitaine 0.93 11,461 83600 ENI 37,415 80172 Chevron Corp. 3.4 84,619 39364 PDVSA 84,820 56592 0. 125 4,087 30592 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.)