.The following table is of profit, revenue, and number of employees of 10 companies. Profit US $ billion Revenue/employee No. of Employees US$ Exxon 11.6 96,180 122800 Royal Dutch 74,286 105100 British Petroleum 70,859 56450 Petrofina SA 67,394 69064 Texao In 92,103 29319 Elf Aquitaine 11,461 83710 ENI 37,417 80179 Chevron Corp. 3.6 84,619 39367 PDVSA 4.7 84,818 56593 0.125 4,088 30595 SK billion US. a) For the 10 companies, the mean profit per company is $ (Round answer to one decimal place.) US. 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.) US/employee. c) The "overall" mean profit per employee is $ (Round answer to nearest whole number.)